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-rw-r--r--synapse/storage/events.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index ca1d4a3986..3d5eb9bc02 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -528,7 +528,7 @@ class EventsStore(SQLBaseStore):
                         # I don't think this can happen, but let's double-check
                         raise Exception(
                             "Context for new extremity event %s has no state "
-                            "group" % event_id,
+                            "group" % (event_id, ),
                         )
 
                     # If we've already seen the state group don't bother adding