diff --git a/client/src/app/core/repositories/motions/motion-comment-section-repository.service.ts b/client/src/app/core/repositories/motions/motion-comment-section-repository.service.ts
index 060b7b21c..87f89c661 100644
--- a/client/src/app/core/repositories/motions/motion-comment-section-repository.service.ts
+++ b/client/src/app/core/repositories/motions/motion-comment-section-repository.service.ts
@@ -12,6 +12,7 @@ import { HttpService } from 'app/core/core-services/http.service';
 import { ViewModelStoreService } from 'app/core/core-services/view-model-store.service';
 import { ViewGroup } from 'app/site/users/models/view-group';
 import { TranslateService } from '@ngx-translate/core';
+import { ViewMotion } from 'app/site/motions/models/view-motion';
 
 /**
  * Repository Services for Categories
@@ -106,17 +107,36 @@ export class MotionCommentSectionRepositoryService extends BaseRepository<
     }
 
     /**
-     * Saves a comment made at a MotionCommentSection
+     * Saves a comment made at a MotionCommentSection. Does an update, if
+     * there is a comment text. Deletes the comment, if the text is empty.
      *
-     * @param motionId ID of the Motion
-     * @param sectionId ID of the Section where the comment was made
+     * @param motion the motion
+     * @param section the section where the comment was made
      * @param sectionComment the comment text
-     * @returns the promise to create the object
+     * @returns the promise from the HTTP request
      */
-    public async saveComment(motionId: number, sectionId: number, sectionComment: String): Promise<object> {
-        return this.http.post(`rest/motions/motion/${motionId}/manage_comments/`, {
-            section_id: sectionId,
-            comment: sectionComment
+    public async saveComment(motion: ViewMotion, section: ViewMotionCommentSection, comment: string): Promise<void> {
+        if (comment) {
+            return await this.updateComment(motion, section, comment);
+        } else {
+            return await this.deleteComment(motion, section);
+        }
+    }
+
+    /**
+     * Updates the comment. Saves it on the server.
+     */
+    private async updateComment(motion: ViewMotion, section: ViewMotionCommentSection, comment: string): Promise<void> {
+        return await this.http.post(`rest/motions/motion/${motion.id}/manage_comments/`, {
+            section_id: section.id,
+            comment: comment
         });
     }
+
+    /**
+     * Deletes a comment from the server
+     */
+    private async deleteComment(motion: ViewMotion, section: ViewMotionCommentSection): Promise<void> {
+        return await this.http.delete(`rest/motions/motion/${motion.id}/manage_comments/`, { section_id: section.id });
+    }
 }
diff --git a/client/src/app/site/motions/components/motion-comments/motion-comments.component.ts b/client/src/app/site/motions/components/motion-comments/motion-comments.component.ts
index 14b821d25..9c0570404 100644
--- a/client/src/app/site/motions/components/motion-comments/motion-comments.component.ts
+++ b/client/src/app/site/motions/components/motion-comments/motion-comments.component.ts
@@ -130,15 +130,13 @@ export class MotionCommentsComponent extends BaseViewComponent {
     }
 
     /**
-     * Saves the comment. Makes a request to the server.
+     * Saves the comment.
      *
      * @param section The section for the comment to save
      */
-    public async saveComment(section: ViewMotionCommentSection): Promise<void> {
+    public saveComment(section: ViewMotionCommentSection): void {
         const commentText = this.commentForms[section.id].get('comment').value;
-        const sectionId = section.id;
-        const motionId = this.motion.id;
-        await this.commentRepo.saveComment(motionId, sectionId, commentText).then(
+        this.commentRepo.saveComment(this.motion, section, commentText).then(
             () => {
                 this.cancelEditing(section);
             },
diff --git a/openslides/utils/auth.py b/openslides/utils/auth.py
index d617eddc3..678ccb5f4 100644
--- a/openslides/utils/auth.py
+++ b/openslides/utils/auth.py
@@ -97,14 +97,10 @@ def in_some_groups(user_id: int, groups: List[int]) -> bool:
     """
     Checks that user is in at least one given group. Groups can be given as a list
     of ids or group instances. If the user is in the admin group (pk = 2) the result
-    is always true.
+    is always true, even if no groups are given.
 
     user_id 0 means anonymous user.
     """
-
-    if len(groups) == 0:
-        return False  # early end here, if no groups are given.
-
     # Convert user to right type
     # TODO: Remove this and make use, that user has always the right type
     user_id = user_to_user_id(user_id)
@@ -115,14 +111,10 @@ async def async_in_some_groups(user_id: int, groups: List[int]) -> bool:
     """
     Checks that user is in at least one given group. Groups can be given as a list
     of ids. If the user is in the admin group (pk = 2) the result
-    is always true.
+    is always true, even if no groups are given.
 
     user_id 0 means anonymous user.
     """
-
-    if not len(groups):
-        return False  # early end here, if no groups are given.
-
     if not user_id and not await async_anonymous_is_enabled():
         in_some_groups = False
     elif not user_id: