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Fix "list index out of range" error #4937

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Fix "list index out of range" error #4937

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2 changes: 1 addition & 1 deletion synapse/handlers/sync.py
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Original file line number Diff line number Diff line change
Expand Up @@ -770,7 +770,7 @@ def compute_state_delta(self, room_id, batch, sync_config, since_token, now_toke
current=current_state_ids,
lazy_load_members=lazy_load_members,
)
elif batch.limited:
elif batch.limited and batch.events:
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To me it sounds like the error in #4842 was due to batch.events being an empty list, rather than None. In that case, this if statement would still run and crash.

Instead you may want to check if len(batch.events) > 0.

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I'm not a Python expert. I found https://stackoverflow.com/questions/53513/how-do-i-check-if-a-list-is-empty

state_at_timeline_start = yield self.store.get_state_ids_for_event(
batch.events[0].event_id, state_filter=state_filter,
)
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