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-rw-r--r--synapse/handlers/room_batch.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/handlers/room_batch.py b/synapse/handlers/room_batch.py
index 29de7e5bed..fbfd748406 100644
--- a/synapse/handlers/room_batch.py
+++ b/synapse/handlers/room_batch.py
@@ -53,6 +53,7 @@ class RoomBatchHandler:
         # We want to use the successor event depth so they appear after `prev_event` because
         # it has a larger `depth` but before the successor event because the `stream_ordering`
         # is negative before the successor event.
+        assert most_recent_prev_event_id is not None
         successor_event_ids = await self.store.get_successor_events(
             most_recent_prev_event_id
         )
@@ -139,6 +140,7 @@ class RoomBatchHandler:
             _,
         ) = await self.store.get_max_depth_of(event_ids)
         # mapping from (type, state_key) -> state_event_id
+        assert most_recent_event_id is not None
         prev_state_map = await self.state_store.get_state_ids_for_event(
             most_recent_event_id
         )