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-rw-r--r--synapse/handlers/message.py14
1 files changed, 10 insertions, 4 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 4a0fccfcc6..b7bc187169 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -1318,6 +1318,8 @@ class EventCreationHandler:
             # user is actually admin or not).
             is_admin_redaction = False
             if event.type == EventTypes.Redaction:
+                assert event.redacts is not None
+
                 original_event = await self.store.get_event(
                     event.redacts,
                     redact_behaviour=EventRedactBehaviour.AS_IS,
@@ -1413,6 +1415,8 @@ class EventCreationHandler:
                 )
 
         if event.type == EventTypes.Redaction:
+            assert event.redacts is not None
+
             original_event = await self.store.get_event(
                 event.redacts,
                 redact_behaviour=EventRedactBehaviour.AS_IS,
@@ -1500,11 +1504,13 @@ class EventCreationHandler:
                 next_batch_id = event.content.get(
                     EventContentFields.MSC2716_NEXT_BATCH_ID
                 )
-                conflicting_insertion_event_id = (
-                    await self.store.get_insertion_event_by_batch_id(
-                        event.room_id, next_batch_id
+                conflicting_insertion_event_id = None
+                if next_batch_id:
+                    conflicting_insertion_event_id = (
+                        await self.store.get_insertion_event_by_batch_id(
+                            event.room_id, next_batch_id
+                        )
                     )
-                )
                 if conflicting_insertion_event_id is not None:
                     # The current insertion event that we're processing is invalid
                     # because an insertion event already exists in the room with the