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-rw-r--r--synapse/state.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/state.py b/synapse/state.py
index a0f807e3b9..4d48cc4605 100644
--- a/synapse/state.py
+++ b/synapse/state.py
@@ -302,6 +302,8 @@ class StateHandler(object):
             if new_state_event_ids == frozenset(e_id for e_id in events):
                 state_group = sg
                 break
+        if not state_group:
+            state_group = self.store.get_next_state_group()
 
         if self._state_cache is not None:
             cache = _StateCacheEntry(