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-rw-r--r--synapse/storage/background_updates.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/background_updates.py b/synapse/storage/background_updates.py
index af9bfbbe47..30d0e4c5dc 100644
--- a/synapse/storage/background_updates.py
+++ b/synapse/storage/background_updates.py
@@ -115,7 +115,7 @@ class BackgroundUpdateStore(SQLBaseStore):
                         "No more background updates to do."
                         " Unscheduling background update task."
                     )
-                    defer.returnValue()
+                    defer.returnValue(None)
 
     @defer.inlineCallbacks
     def do_next_background_update(self, desired_duration_ms):