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-rw-r--r--synapse/handlers/room.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index f865bed1ec..2823ca6f0d 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -549,7 +549,7 @@ class RoomCreationHandler:
         except (TypeError, ValueError):
             ban = 50
         needed_power_level = max(
-            state_default_int, ban, max(event_power_levels.values())
+            state_default_int, ban, max(event_power_levels.values(), default=0)
         )
 
         # Get the user's current power level, this matches the logic in get_user_power_level,