diff --git a/openslides/agenda/models.py b/openslides/agenda/models.py
index 8c6c709a1..e25f00498 100644
--- a/openslides/agenda/models.py
+++ b/openslides/agenda/models.py
@@ -426,12 +426,12 @@ class SpeakerManager(models.Manager):
         list of speakers and that someone is twice on one list (off coming
         speakers). Cares also initial sorting of the coming speakers.
         """
+        if isinstance(user, AnonymousUser):
+            raise OpenSlidesError("An anonymous user can not be on lists of speakers.")
         if self.filter(
             user=user, list_of_speakers=list_of_speakers, begin_time=None
         ).exists():
             raise OpenSlidesError(f"{user} is already on the list of speakers.")
-        if isinstance(user, AnonymousUser):
-            raise OpenSlidesError("An anonymous user can not be on lists of speakers.")
         if config["agenda_present_speakers_only"] and not user.is_present:
             raise OpenSlidesError("Only present users can be on the lists of speakers.")
         weight = (
@@ -443,7 +443,11 @@ class SpeakerManager(models.Manager):
         speaker = self.model(
             list_of_speakers=list_of_speakers, user=user, weight=weight + 1
         )
-        speaker.save(force_insert=True, skip_autoupdate=skip_autoupdate)
+        speaker.save(
+            force_insert=True,
+            skip_autoupdate=skip_autoupdate,
+            no_delete_on_restriction=True,
+        )
         return speaker
 
 
diff --git a/openslides/agenda/views.py b/openslides/agenda/views.py
index 0d98122f9..9d60f3c70 100644
--- a/openslides/agenda/views.py
+++ b/openslides/agenda/views.py
@@ -356,8 +356,7 @@ class ListOfSpeakersViewSet(
 
             # Send new speaker via autoupdate because users without permission
             # to see users may not have it but can get it now.
-            inform_changed_data([user])
-            # TODO: inform_changed_data(user) should work. But isinstance(user, Iterable) is true...
+            inform_changed_data(user, disable_history=True)
 
         # Toggle 'marked' for the speaker
         elif request.method == "PATCH":
diff --git a/openslides/assignments/access_permissions.py b/openslides/assignments/access_permissions.py
index 9a76c5bd5..33b684a9a 100644
--- a/openslides/assignments/access_permissions.py
+++ b/openslides/assignments/access_permissions.py
@@ -1,11 +1,8 @@
-from typing import Any, Dict, List
-
 from ..poll.access_permissions import (
     BasePollAccessPermissions,
     BaseVoteAccessPermissions,
 )
 from ..utils.access_permissions import BaseAccessPermissions
-from ..utils.auth import async_has_perm
 
 
 class AssignmentAccessPermissions(BaseAccessPermissions):
@@ -15,38 +12,6 @@ class AssignmentAccessPermissions(BaseAccessPermissions):
 
     base_permission = "assignments.can_see"
 
-    async def get_restricted_data(
-        self, full_data: List[Dict[str, Any]], user_id: int
-    ) -> List[Dict[str, Any]]:
-        """
-        Returns the restricted serialized data for the instance prepared
-        for the user. Removes unpublished polls for non admins so that they
-        only get a result like the AssignmentShortSerializer would give them.
-        """
-        # Parse data.
-        if await async_has_perm(
-            user_id, "assignments.can_see"
-        ) and await async_has_perm(user_id, "assignments.can_manage"):
-            data = full_data
-        elif await async_has_perm(user_id, "assignments.can_see"):
-            # Exclude unpublished poll votes.
-            data = []
-            for full in full_data:
-                full_copy = full.copy()
-                polls = full_copy["polls"]
-                for poll in polls:
-                    if not poll["published"]:
-                        for option in poll["options"]:
-                            option["votes"] = []  # clear votes for not published polls
-                        poll[
-                            "has_votes"
-                        ] = False  # A user should see, if there are votes.
-                data.append(full_copy)
-        else:
-            data = []
-
-        return data
-
 
 class AssignmentPollAccessPermissions(BasePollAccessPermissions):
     base_permission = "assignments.can_see"
diff --git a/openslides/utils/autoupdate.py b/openslides/utils/autoupdate.py
index 5aeabde67..7701b1598 100644
--- a/openslides/utils/autoupdate.py
+++ b/openslides/utils/autoupdate.py
@@ -9,7 +9,7 @@ from mypy_extensions import TypedDict
 
 from .cache import element_cache, get_element_id
 from .projector import get_projector_data
-from .utils import get_model_from_collection_string
+from .utils import get_model_from_collection_string, is_iterable
 
 
 class AutoupdateElementBase(TypedDict):
@@ -150,6 +150,7 @@ def inform_changed_data(
     instances: Union[Iterable[Model], Model],
     information: List[str] = None,
     user_id: Optional[int] = None,
+    disable_history: bool = False,
     no_delete_on_restriction: bool = False,
 ) -> None:
     """
@@ -162,7 +163,7 @@ def inform_changed_data(
     """
     if information is None:
         information = []
-    if not isinstance(instances, Iterable):
+    if not is_iterable(instances):
         instances = (instances,)
 
     root_instances = set(instance.get_root_rest_element() for instance in instances)
@@ -170,6 +171,7 @@ def inform_changed_data(
         AutoupdateElement(
             id=root_instance.get_rest_pk(),
             collection_string=root_instance.get_collection_string(),
+            disable_history=disable_history,
             information=information,
             user_id=user_id,
             no_delete_on_restriction=no_delete_on_restriction,
diff --git a/openslides/utils/utils.py b/openslides/utils/utils.py
index f739f1304..f068730be 100644
--- a/openslides/utils/utils.py
+++ b/openslides/utils/utils.py
@@ -72,6 +72,20 @@ def is_int(obj: Any) -> bool:
         return False
 
 
+def is_iterable(obj: Any) -> bool:
+    """
+    Do not rely on `isinstance(obj, Iterable` with `Iterable` being imperted
+    from typing. This breaks at proxyobjects, like SimpleLazyObjects from Django.
+    Instead try to get the iterable from the object. THis fails on non-iterable
+    proxyobjects.
+    """
+    try:
+        iter(obj)
+        return True
+    except TypeError:
+        return False
+
+
 _models_to_collection_string: Dict[str, Type[Model]] = {}