diff --git a/client/src/app/base.component.ts b/client/src/app/base.component.ts
index 689a39f8c..13d1a5342 100644
--- a/client/src/app/base.component.ts
+++ b/client/src/app/base.component.ts
@@ -1,5 +1,5 @@
 import { Title } from '@angular/platform-browser';
-import { OpenSlidesComponent } from './openslides.component';
+
 import { TranslateService } from '@ngx-translate/core';
 
 /**
@@ -9,7 +9,7 @@ import { TranslateService } from '@ngx-translate/core';
  * A BaseComponent is an OpenSlides Component.
  * Components in the 'Side'- or 'projector' Folder are BaseComponents
  */
-export abstract class BaseComponent extends OpenSlidesComponent {
+export abstract class BaseComponent {
     /**
      * To manipulate the browser title bar, adds the Suffix "OpenSlides"
      *
@@ -38,12 +38,7 @@ export abstract class BaseComponent extends OpenSlidesComponent {
             link image charmap table | code preview fullscreen`
     };
 
-    /**
-     * Child constructor that implements the titleServices and calls Super from OpenSlidesComponent
-     */
-    public constructor(protected titleService?: Title, protected translate?: TranslateService) {
-        super();
-    }
+    public constructor(protected titleService?: Title, protected translate?: TranslateService) {}
 
     /**
      * Set the title in web browser using angulars TitleService
diff --git a/client/src/app/core/core-services/auth.service.ts b/client/src/app/core/core-services/auth.service.ts
index 33e68633d..502c5aa55 100644
--- a/client/src/app/core/core-services/auth.service.ts
+++ b/client/src/app/core/core-services/auth.service.ts
@@ -2,7 +2,6 @@ import { Injectable } from '@angular/core';
 import { Router } from '@angular/router';
 
 import { OperatorService } from 'app/core/core-services/operator.service';
-import { OpenSlidesComponent } from '../../openslides.component';
 import { environment } from 'environments/environment';
 import { User } from '../../shared/models/users/user';
 import { OpenSlidesService } from './openslides.service';
@@ -22,11 +21,10 @@ interface LoginResponse {
 @Injectable({
     providedIn: 'root'
 })
-export class AuthService extends OpenSlidesComponent {
+export class AuthService {
     /**
      * Initializes the httpClient and the {@link OperatorService}.
      *
-     * Calls `super()` from the parent class.
      * @param http HttpService to send requests to the server
      * @param operator Who is using OpenSlides
      * @param OpenSlides The openslides service
@@ -37,9 +35,7 @@ export class AuthService extends OpenSlidesComponent {
         private operator: OperatorService,
         private OpenSlides: OpenSlidesService,
         private router: Router
-    ) {
-        super();
-    }
+    ) {}
 
     /**
      * Try to log in a user.
diff --git a/client/src/app/core/core-services/autoupdate.service.ts b/client/src/app/core/core-services/autoupdate.service.ts
index 8873789d0..2944a4cae 100644
--- a/client/src/app/core/core-services/autoupdate.service.ts
+++ b/client/src/app/core/core-services/autoupdate.service.ts
@@ -1,8 +1,6 @@
 import { Injectable } from '@angular/core';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { WebsocketService } from './websocket.service';
-
 import { CollectionStringMapperService } from './collectionStringMapper.service';
 import { DataStoreService } from './data-store.service';
 import { BaseModel } from '../../shared/models/base/base-model';
@@ -42,13 +40,11 @@ interface AutoupdateFormat {
  * Handles the initial update and automatic updates using the {@link WebsocketService}
  * Incoming objects, usually BaseModels, will be saved in the dataStore (`this.DS`)
  * This service usually creates all models
- *
- * The dataStore will injected over the parent class: {@link OpenSlidesComponent}.
  */
 @Injectable({
     providedIn: 'root'
 })
-export class AutoupdateService extends OpenSlidesComponent {
+export class AutoupdateService {
     /**
      * Constructor to create the AutoupdateService. Calls the constructor of the parent class.
      * @param websocketService
@@ -60,7 +56,6 @@ export class AutoupdateService extends OpenSlidesComponent {
         private DS: DataStoreService,
         private modelMapper: CollectionStringMapperService
     ) {
-        super();
         this.websocketService.getOberservable<AutoupdateFormat>('autoupdate').subscribe(response => {
             this.storeResponse(response);
         });
diff --git a/client/src/app/core/core-services/notify.service.ts b/client/src/app/core/core-services/notify.service.ts
index 16fc55aac..54bce4539 100644
--- a/client/src/app/core/core-services/notify.service.ts
+++ b/client/src/app/core/core-services/notify.service.ts
@@ -2,7 +2,6 @@ import { Injectable } from '@angular/core';
 
 import { Subject, Observable } from 'rxjs';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { WebsocketService } from './websocket.service';
 import { OperatorService } from './operator.service';
 
@@ -66,7 +65,7 @@ export interface NotifyResponse<T> extends NotifyBase<T> {
 @Injectable({
     providedIn: 'root'
 })
-export class NotifyService extends OpenSlidesComponent {
+export class NotifyService {
     /**
      * A general subject for all messages.
      */
@@ -84,8 +83,6 @@ export class NotifyService extends OpenSlidesComponent {
      * @param websocketService
      */
     public constructor(private websocketService: WebsocketService, private operator: OperatorService) {
-        super();
-
         websocketService.getOberservable<NotifyResponse<any>>('notify').subscribe(notify => {
             notify.sendByThisUser = notify.senderUserId === (this.operator.user ? this.operator.user.id : 0);
             this.notifySubject.next(notify);
diff --git a/client/src/app/core/core-services/offline.service.ts b/client/src/app/core/core-services/offline.service.ts
index d567b5e85..d5a5b2da5 100644
--- a/client/src/app/core/core-services/offline.service.ts
+++ b/client/src/app/core/core-services/offline.service.ts
@@ -1,6 +1,5 @@
 import { Injectable } from '@angular/core';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { DataStoreService } from './data-store.service';
 import { WhoAmIResponse } from './operator.service';
 
@@ -13,7 +12,7 @@ import { WhoAmIResponse } from './operator.service';
 @Injectable({
     providedIn: 'root'
 })
-export class OfflineService extends OpenSlidesComponent {
+export class OfflineService {
     private _offline = false;
 
     public get offline(): boolean {
@@ -24,9 +23,7 @@ export class OfflineService extends OpenSlidesComponent {
      * Constructor to create the AutoupdateService. Calls the constructor of the parent class.
      * @param DS
      */
-    public constructor(private DS: DataStoreService) {
-        super();
-    }
+    public constructor(private DS: DataStoreService) {}
 
     /**
      * Sets the offline flag. Restores the DataStoreService to the last known configuration.
diff --git a/client/src/app/core/core-services/openslides.service.ts b/client/src/app/core/core-services/openslides.service.ts
index 615d5df37..82453e800 100644
--- a/client/src/app/core/core-services/openslides.service.ts
+++ b/client/src/app/core/core-services/openslides.service.ts
@@ -1,7 +1,6 @@
 import { Injectable } from '@angular/core';
 import { Router } from '@angular/router';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { WebsocketService } from './websocket.service';
 import { OperatorService } from './operator.service';
 import { StorageService } from './storage.service';
@@ -14,7 +13,7 @@ import { DataStoreService } from './data-store.service';
 @Injectable({
     providedIn: 'root'
 })
-export class OpenSlidesService extends OpenSlidesComponent {
+export class OpenSlidesService {
     /**
      * if the user tries to access a certain URL without being authenticated, the URL will be stored here
      */
@@ -37,8 +36,6 @@ export class OpenSlidesService extends OpenSlidesComponent {
         private autoupdateService: AutoupdateService,
         private DS: DataStoreService
     ) {
-        super();
-
         // Handler that gets called, if the websocket connection reconnects after a disconnection.
         // There might have changed something on the server, so we check the operator, if he changed.
         websocketService.reconnectEvent.subscribe(() => {
diff --git a/client/src/app/core/core-services/operator.service.ts b/client/src/app/core/core-services/operator.service.ts
index 132a852fc..901043f2d 100644
--- a/client/src/app/core/core-services/operator.service.ts
+++ b/client/src/app/core/core-services/operator.service.ts
@@ -3,7 +3,6 @@ import { HttpClient } from '@angular/common/http';
 
 import { Observable, BehaviorSubject } from 'rxjs';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { Group } from 'app/shared/models/users/group';
 import { User } from '../../shared/models/users/user';
 import { environment } from 'environments/environment';
@@ -34,13 +33,11 @@ export interface WhoAmIResponse {
  *
  * Changes in operator can be observed, directives do so on order to show
  * or hide certain information.
- *
- * The operator is an {@link OpenSlidesComponent}.
  */
 @Injectable({
     providedIn: 'root'
 })
-export class OperatorService extends OpenSlidesComponent implements OnAfterAppsLoaded {
+export class OperatorService implements OnAfterAppsLoaded {
     /**
      * The operator.
      */
@@ -119,8 +116,6 @@ export class OperatorService extends OpenSlidesComponent implements OnAfterAppsL
         private offlineService: OfflineService,
         private collectionStringMapperService: CollectionStringMapperService
     ) {
-        super();
-
         this.DS.changeObservable.subscribe(newModel => {
             if (this._user) {
                 if (newModel instanceof Group) {
diff --git a/client/src/app/core/core-services/projector.service.ts b/client/src/app/core/core-services/projector.service.ts
index b98a5e096..c29343f90 100644
--- a/client/src/app/core/core-services/projector.service.ts
+++ b/client/src/app/core/core-services/projector.service.ts
@@ -1,6 +1,5 @@
 import { Injectable } from '@angular/core';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import {
     Projectable,
     ProjectorElementBuildDeskriptor,
@@ -29,7 +28,7 @@ import { ViewModelStoreService } from './view-model-store.service';
 @Injectable({
     providedIn: 'root'
 })
-export class ProjectorService extends OpenSlidesComponent {
+export class ProjectorService {
     /**
      * Constructor.
      *
@@ -41,9 +40,7 @@ export class ProjectorService extends OpenSlidesComponent {
         private http: HttpService,
         private slideManager: SlideManager,
         private viewModelStore: ViewModelStoreService
-    ) {
-        super();
-    }
+    ) {}
 
     /**
      * Retusn the identifiable projector element from the given types of slides/elements/descriptors
diff --git a/client/src/app/core/core-services/servertime.service.ts b/client/src/app/core/core-services/servertime.service.ts
index 9f079736f..ff6ac39b4 100644
--- a/client/src/app/core/core-services/servertime.service.ts
+++ b/client/src/app/core/core-services/servertime.service.ts
@@ -2,7 +2,6 @@ import { Injectable } from '@angular/core';
 
 import { BehaviorSubject, Observable } from 'rxjs';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { HttpService } from './http.service';
 import { environment } from 'environments/environment.prod';
 
@@ -16,7 +15,7 @@ import { environment } from 'environments/environment.prod';
 @Injectable({
     providedIn: 'root'
 })
-export class ServertimeService extends OpenSlidesComponent {
+export class ServertimeService {
     private static FAILURE_TIMEOUT = 30;
     private static NORMAL_TIMEOUT = 60 * 5;
 
@@ -25,9 +24,7 @@ export class ServertimeService extends OpenSlidesComponent {
      */
     private serverOffsetSubject = new BehaviorSubject<number>(0);
 
-    public constructor(private http: HttpService) {
-        super();
-    }
+    public constructor(private http: HttpService) {}
 
     /**
      * Starts the scheduler to sync with the server.
diff --git a/client/src/app/core/repositories/base-repository.ts b/client/src/app/core/repositories/base-repository.ts
index fe5279bf2..6326075fe 100644
--- a/client/src/app/core/repositories/base-repository.ts
+++ b/client/src/app/core/repositories/base-repository.ts
@@ -1,6 +1,5 @@
 import { BehaviorSubject, Observable, Subject } from 'rxjs';
 
-import { OpenSlidesComponent } from '../../openslides.component';
 import { BaseViewModel } from '../../site/base/base-view-model';
 import { BaseModel, ModelConstructor } from '../../shared/models/base/base-model';
 import { CollectionStringMapperService } from '../core-services/collectionStringMapper.service';
@@ -10,8 +9,7 @@ import { auditTime } from 'rxjs/operators';
 import { ViewModelStoreService } from '../core-services/view-model-store.service';
 import { OnAfterAppsLoaded } from '../onAfterAppsLoaded';
 
-export abstract class BaseRepository<V extends BaseViewModel, M extends BaseModel> extends OpenSlidesComponent
-    implements OnAfterAppsLoaded {
+export abstract class BaseRepository<V extends BaseViewModel, M extends BaseModel> implements OnAfterAppsLoaded {
     /**
      * Stores all the viewModel in an object
      */
@@ -54,7 +52,6 @@ export abstract class BaseRepository<V extends BaseViewModel, M extends BaseMode
         protected baseModelCtor: ModelConstructor<M>,
         protected depsModelCtors?: ModelConstructor<BaseModel>[]
     ) {
-        super();
         this._name = baseModelCtor.name;
     }
 
diff --git a/client/src/app/core/ui-services/choice.service.ts b/client/src/app/core/ui-services/choice.service.ts
index 88e1d4680..b00db214d 100644
--- a/client/src/app/core/ui-services/choice.service.ts
+++ b/client/src/app/core/ui-services/choice.service.ts
@@ -1,6 +1,6 @@
 import { Injectable } from '@angular/core';
-import { OpenSlidesComponent } from '../../openslides.component';
 import { MatDialog } from '@angular/material';
+
 import {
     ChoiceDialogComponent,
     ChoiceDialogOptions,
@@ -13,15 +13,13 @@ import {
 @Injectable({
     providedIn: 'root'
 })
-export class ChoiceService extends OpenSlidesComponent {
+export class ChoiceService {
     /**
      * Ctor.
      *
      * @param dialog For opening the ChoiceDialog
      */
-    public constructor(private dialog: MatDialog) {
-        super();
-    }
+    public constructor(private dialog: MatDialog) {}
 
     /**
      * Opens the dialog. Returns the chosen value after the user accepts.
diff --git a/client/src/app/core/ui-services/config.service.ts b/client/src/app/core/ui-services/config.service.ts
index 044b315fc..c3cb275e3 100644
--- a/client/src/app/core/ui-services/config.service.ts
+++ b/client/src/app/core/ui-services/config.service.ts
@@ -1,6 +1,5 @@
 import { Injectable } from '@angular/core';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { Observable, BehaviorSubject } from 'rxjs';
 import { Config } from '../../shared/models/core/config';
 import { DataStoreService } from '../core-services/data-store.service';
@@ -23,7 +22,7 @@ import { DataStoreService } from '../core-services/data-store.service';
 @Injectable({
     providedIn: 'root'
 })
-export class ConfigService extends OpenSlidesComponent {
+export class ConfigService {
     /**
      * Stores a subject per key. Values are published, if the DataStore gets an update.
      */
@@ -33,8 +32,6 @@ export class ConfigService extends OpenSlidesComponent {
      * Listen for changes of config variables.
      */
     public constructor(private DS: DataStoreService) {
-        super();
-
         this.DS.changeObservable.subscribe(data => {
             // on changes notify the observers for specific keys.
             if (data instanceof Config && this.configSubjects[data.key]) {
diff --git a/client/src/app/core/ui-services/constants.service.ts b/client/src/app/core/ui-services/constants.service.ts
index ca67ebd5a..e4a0cc61f 100644
--- a/client/src/app/core/ui-services/constants.service.ts
+++ b/client/src/app/core/ui-services/constants.service.ts
@@ -1,6 +1,5 @@
 import { Injectable } from '@angular/core';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { WebsocketService } from '../core-services/websocket.service';
 import { Observable, of, Subject } from 'rxjs';
 
@@ -24,7 +23,7 @@ interface Constants {
 @Injectable({
     providedIn: 'root'
 })
-export class ConstantsService extends OpenSlidesComponent {
+export class ConstantsService {
     /**
      * The constants
      */
@@ -49,8 +48,6 @@ export class ConstantsService extends OpenSlidesComponent {
      * @param websocketService
      */
     public constructor(private websocketService: WebsocketService) {
-        super();
-
         // The hook for recieving constants.
         websocketService.getOberservable<Constants>('constants').subscribe(constants => {
             this.constants = constants;
diff --git a/client/src/app/core/ui-services/count-users.service.ts b/client/src/app/core/ui-services/count-users.service.ts
index 5fcab88a5..fb2698a2e 100644
--- a/client/src/app/core/ui-services/count-users.service.ts
+++ b/client/src/app/core/ui-services/count-users.service.ts
@@ -2,7 +2,6 @@ import { Injectable } from '@angular/core';
 
 import { Observable, Subject } from 'rxjs';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { NotifyService } from '../core-services/notify.service';
 import { OperatorService } from '../core-services/operator.service';
 
@@ -25,7 +24,7 @@ const RESPONSE_NAME = 'count-user-response';
 @Injectable({
     providedIn: 'root'
 })
-export class CountUsersService extends OpenSlidesComponent {
+export class CountUsersService {
     private activeCounts: { [token: string]: Subject<number> } = {};
 
     private currentUserId: number;
@@ -37,8 +36,6 @@ export class CountUsersService extends OpenSlidesComponent {
      * @param operator
      */
     public constructor(private notifyService: NotifyService, operator: OperatorService) {
-        super();
-
         // Listen for requests to send an answer.
         this.notifyService.getMessageObservable<CountUserRequest>(REQUEST_NAME).subscribe(request => {
             if (request.content.token) {
diff --git a/client/src/app/core/ui-services/login-data.service.ts b/client/src/app/core/ui-services/login-data.service.ts
index 0ac74d893..2b4940199 100644
--- a/client/src/app/core/ui-services/login-data.service.ts
+++ b/client/src/app/core/ui-services/login-data.service.ts
@@ -2,7 +2,6 @@ import { Injectable } from '@angular/core';
 
 import { BehaviorSubject, Observable } from 'rxjs';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { ConfigService } from './config.service';
 
 /**
@@ -12,7 +11,7 @@ import { ConfigService } from './config.service';
 @Injectable({
     providedIn: 'root'
 })
-export class LoginDataService extends OpenSlidesComponent {
+export class LoginDataService {
     /**
      * Holds the privacy policy
      */
@@ -43,8 +42,6 @@ export class LoginDataService extends OpenSlidesComponent {
      * @param configService
      */
     public constructor(private configService: ConfigService) {
-        super();
-
         this.configService.get<string>('general_event_privacy_policy').subscribe(value => {
             this.setPrivacyPolicy(value);
         });
diff --git a/client/src/app/core/ui-services/projection-dialog.service.ts b/client/src/app/core/ui-services/projection-dialog.service.ts
index afe147133..f59350bb0 100644
--- a/client/src/app/core/ui-services/projection-dialog.service.ts
+++ b/client/src/app/core/ui-services/projection-dialog.service.ts
@@ -1,8 +1,7 @@
 import { Injectable } from '@angular/core';
-
-import { OpenSlidesComponent } from 'app/openslides.component';
-import { Projectable, ProjectorElementBuildDeskriptor, isProjectable } from 'app/site/base/projectable';
 import { MatDialog } from '@angular/material';
+
+import { Projectable, ProjectorElementBuildDeskriptor, isProjectable } from 'app/site/base/projectable';
 import {
     ProjectionDialogComponent,
     ProjectionDialogReturnType
@@ -15,16 +14,14 @@ import { ProjectorService } from '../core-services/projector.service';
 @Injectable({
     providedIn: 'root'
 })
-export class ProjectionDialogService extends OpenSlidesComponent {
+export class ProjectionDialogService {
     /**
      * Constructor.
      *
      * @param dialog
      * @param projectorService
      */
-    public constructor(private dialog: MatDialog, private projectorService: ProjectorService) {
-        super();
-    }
+    public constructor(private dialog: MatDialog, private projectorService: ProjectorService) {}
 
     /**
      * Opens the projection dialog for the given projectable. After the user's choice,
diff --git a/client/src/app/core/ui-services/prompt.service.ts b/client/src/app/core/ui-services/prompt.service.ts
index 4ea605d40..ead337231 100644
--- a/client/src/app/core/ui-services/prompt.service.ts
+++ b/client/src/app/core/ui-services/prompt.service.ts
@@ -1,5 +1,4 @@
 import { Injectable } from '@angular/core';
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { PromptDialogComponent } from '../../shared/components/prompt-dialog/prompt-dialog.component';
 import { MatDialog } from '@angular/material';
 
@@ -9,10 +8,8 @@ import { MatDialog } from '@angular/material';
 @Injectable({
     providedIn: 'root'
 })
-export class PromptService extends OpenSlidesComponent {
-    public constructor(private dialog: MatDialog) {
-        super();
-    }
+export class PromptService {
+    public constructor(private dialog: MatDialog) {}
 
     /**
      * Opens the dialog. Returns true, if the user accepts.
diff --git a/client/src/app/core/ui-services/tree.service.ts b/client/src/app/core/ui-services/tree.service.ts
index c02fc40d8..47b7656b8 100644
--- a/client/src/app/core/ui-services/tree.service.ts
+++ b/client/src/app/core/ui-services/tree.service.ts
@@ -1,6 +1,5 @@
 import { Injectable } from '@angular/core';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { Displayable } from 'app/site/base/displayable';
 import { Identifiable } from 'app/shared/models/base/identifiable';
 
@@ -21,14 +20,7 @@ export interface OSTreeNode<T> {
 @Injectable({
     providedIn: 'root'
 })
-export class TreeService extends OpenSlidesComponent {
-    /**
-     * Yes, a constructor.
-     */
-    public constructor() {
-        super();
-    }
-
+export class TreeService {
     /**
      * Returns the weight casted to a number from a given model.
      *
diff --git a/client/src/app/openslides.component.ts b/client/src/app/openslides.component.ts
deleted file mode 100644
index b2dfb4529..000000000
--- a/client/src/app/openslides.component.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-import { Observable, of } from 'rxjs';
-
-/**
- * injects the {@link DataStoreService} to all its children and provides a generic function to catch errors
- * should be abstract and a mere parent to all {@link DataStoreService} accessors
- */
-export abstract class OpenSlidesComponent {
-    /**
-     * Empty constructor
-     *
-     * Static injection of {@link DataStoreService} in all child instances of OpenSlidesComponent
-     * Throws a warning even tho it is the new syntax. Ignored for now.
-     */
-    public constructor() {}
-
-    /**
-     * Generic error handling for everything that makes HTTP Calls
-     * TODO: could have more features
-     * @return an observable error
-     */
-    public handleError<T>(): (error: any) => Observable<T> {
-        return (error: any): Observable<T> => {
-            console.error(error);
-            return of(error);
-        };
-    }
-}
diff --git a/client/src/app/shared/directives/perms.directive.ts b/client/src/app/shared/directives/perms.directive.ts
index d5f9f2863..8ee3f8cef 100644
--- a/client/src/app/shared/directives/perms.directive.ts
+++ b/client/src/app/shared/directives/perms.directive.ts
@@ -3,7 +3,6 @@ import { Directive, Input, TemplateRef, ViewContainerRef, OnDestroy, OnInit } fr
 import { Subscription } from 'rxjs';
 
 import { OperatorService, Permission } from 'app/core/core-services/operator.service';
-import { OpenSlidesComponent } from 'app/openslides.component';
 
 /**
  * Directive to check if the {@link OperatorService} has the correct permissions to access certain functions
@@ -15,7 +14,7 @@ import { OpenSlidesComponent } from 'app/openslides.component';
 @Directive({
     selector: '[osPerms]'
 })
-export class PermsDirective extends OpenSlidesComponent implements OnInit, OnDestroy {
+export class PermsDirective implements OnInit, OnDestroy {
     /**
      * Holds the required permissions the access a feature
      */
@@ -62,9 +61,7 @@ export class PermsDirective extends OpenSlidesComponent implements OnInit, OnDes
         private template: TemplateRef<any>,
         private viewContainer: ViewContainerRef,
         private operator: OperatorService
-    ) {
-        super();
-    }
+    ) {}
 
     public ngOnInit(): void {
         // observe groups of operator, so the directive can actively react to changes
diff --git a/client/src/app/shared/models/base/base-model.ts b/client/src/app/shared/models/base/base-model.ts
index 06e1fac43..20f996644 100644
--- a/client/src/app/shared/models/base/base-model.ts
+++ b/client/src/app/shared/models/base/base-model.ts
@@ -1,4 +1,3 @@
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { Deserializable } from './deserializable';
 import { Identifiable } from './identifiable';
 import { Collection } from './collection';
@@ -9,8 +8,7 @@ export type ModelConstructor<T extends BaseModel<T>> = new (...args: any[]) => T
  * Abstract parent class to set rules and functions for all models.
  * When inherit from this class, give the subclass as the type. E.g. `class Motion extends BaseModel<Motion>`
  */
-export abstract class BaseModel<T = object> extends OpenSlidesComponent
-    implements Deserializable, Identifiable, Collection {
+export abstract class BaseModel<T = object> implements Deserializable, Identifiable, Collection {
     /**
      * force children of BaseModel to have a collectionString.
      *
@@ -40,7 +38,6 @@ export abstract class BaseModel<T = object> extends OpenSlidesComponent
      * @param input
      */
     protected constructor(collectionString: string, input?: any) {
-        super();
         this._collectionString = collectionString;
 
         if (input) {
diff --git a/client/src/app/site/common/services/count-user-statistics.service.ts b/client/src/app/site/common/services/count-user-statistics.service.ts
index 3b40865a0..6180af78a 100644
--- a/client/src/app/site/common/services/count-user-statistics.service.ts
+++ b/client/src/app/site/common/services/count-user-statistics.service.ts
@@ -1,6 +1,5 @@
 import { Injectable } from '@angular/core';
 
-import { OpenSlidesComponent } from 'app/openslides.component';
 import { CountUsersService } from 'app/core/ui-services/count-users.service';
 import { Observable, BehaviorSubject } from 'rxjs';
 import { UserRepositoryService } from 'app/core/repositories/users/user-repository.service';
@@ -30,12 +29,10 @@ export interface CountUserStatistics {
 @Injectable({
     providedIn: 'root'
 })
-export class CountUsersStatisticsService extends OpenSlidesComponent {
+export class CountUsersStatisticsService {
     private runningCounts: { [token: string]: BehaviorSubject<CountUserStatistics> } = {};
 
-    public constructor(private countUserService: CountUsersService, private userRepo: UserRepositoryService) {
-        super();
-    }
+    public constructor(private countUserService: CountUsersService, private userRepo: UserRepositoryService) {}
 
     /**
      * Starts counting users.