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-rw-r--r--synapse/storage/state.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index 24503cd5aa..d1e679719b 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -37,7 +37,7 @@ class _GetStateGroupDelta(namedtuple("_GetStateGroupDelta", ("prev_group", "delt
     __slots__ = []
 
     def __len__(self):
-        return len(self.delta_ids) if self.delta_ids else None
+        return len(self.delta_ids) if self.delta_ids else 0
 
 
 class StateStore(SQLBaseStore):