2 files changed, 3 insertions, 3 deletions
diff --git a/synapse/storage/data_stores/main/account_data.py b/synapse/storage/data_stores/main/account_data.py
index a96fe9485c..1a3dd7be8d 100644
--- a/synapse/storage/data_stores/main/account_data.py
+++ b/synapse/storage/data_stores/main/account_data.py
@@ -250,7 +250,7 @@ class AccountDataWorkerStore(SQLBaseStore):
             user_id, int(stream_id)
         )
         if not changed:
-            return {}, {}
+            return defer.succeed(({}, {}))
 
         return self.db.runInteraction(
             "get_updated_account_data_for_user", get_updated_account_data_for_user_txn
diff --git a/synapse/storage/data_stores/main/group_server.py b/synapse/storage/data_stores/main/group_server.py
index 7f5e8dce66..6acd45e9f3 100644
--- a/synapse/storage/data_stores/main/group_server.py
+++ b/synapse/storage/data_stores/main/group_server.py
@@ -1111,7 +1111,7 @@ class GroupServerStore(SQLBaseStore):
             user_id, from_token
         )
         if not has_changed:
-            return []
+            return defer.succeed([])
 
         def _get_groups_changes_for_user_txn(txn):
             sql = """
@@ -1141,7 +1141,7 @@ class GroupServerStore(SQLBaseStore):
             from_token
         )
         if not has_changed:
-            return []
+            return defer.succeed([])
 
         def _get_all_groups_changes_txn(txn):
             sql = """