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-rw-r--r--synapse/handlers/message.py29
1 files changed, 18 insertions, 11 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index d6e90ef259..845f683358 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -50,6 +50,7 @@ from synapse.event_auth import validate_event_for_room_version
 from synapse.events import EventBase, relation_from_event
 from synapse.events.builder import EventBuilder
 from synapse.events.snapshot import EventContext
+from synapse.events.utils import maybe_upsert_event_field
 from synapse.events.validator import EventValidator
 from synapse.handlers.directory import DirectoryHandler
 from synapse.logging import opentracing
@@ -1739,12 +1740,15 @@ class EventCreationHandler:
 
             if event.type == EventTypes.Member:
                 if event.content["membership"] == Membership.INVITE:
-                    event.unsigned[
-                        "invite_room_state"
-                    ] = await self.store.get_stripped_room_state_from_event_context(
-                        context,
-                        self.room_prejoin_state_types,
-                        membership_user_id=event.sender,
+                    maybe_upsert_event_field(
+                        event,
+                        event.unsigned,
+                        "invite_room_state",
+                        await self.store.get_stripped_room_state_from_event_context(
+                            context,
+                            self.room_prejoin_state_types,
+                            membership_user_id=event.sender,
+                        ),
                     )
 
                     invitee = UserID.from_string(event.state_key)
@@ -1762,11 +1766,14 @@ class EventCreationHandler:
                         event.signatures.update(returned_invite.signatures)
 
                 if event.content["membership"] == Membership.KNOCK:
-                    event.unsigned[
-                        "knock_room_state"
-                    ] = await self.store.get_stripped_room_state_from_event_context(
-                        context,
-                        self.room_prejoin_state_types,
+                    maybe_upsert_event_field(
+                        event,
+                        event.unsigned,
+                        "knock_room_state",
+                        await self.store.get_stripped_room_state_from_event_context(
+                            context,
+                            self.room_prejoin_state_types,
+                        ),
                     )
 
             if event.type == EventTypes.Redaction: