1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/database.py b/synapse/storage/database.py
index f80d822c12..ccf9ac51ef 100644
--- a/synapse/storage/database.py
+++ b/synapse/storage/database.py
@@ -907,7 +907,7 @@ class DatabasePool:
         # The sort is to ensure that we don't rely on dictionary iteration
         # order.
         keys, vals = zip(
-            *[zip(*(sorted(i.items(), key=lambda kv: kv[0]))) for i in values if i]
+            *(zip(*(sorted(i.items(), key=lambda kv: kv[0]))) for i in values if i)
         )
 
         for k in keys: