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-rw-r--r--synapse/handlers/federation.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index c0dcf9abf8..13865c470c 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -1299,7 +1299,7 @@ class FederationHandler(BaseHandler):
             # Check whether this room is the result of an upgrade of a room we already know
             # about. If so, migrate over user information
             predecessor = yield self.store.get_room_predecessor(room_id)
-            if not predecessor:
+            if not predecessor or not isinstance(predecessor.get("room_id"), str):
                 return
             old_room_id = predecessor["room_id"]
             logger.debug(
@@ -1542,7 +1542,7 @@ class FederationHandler(BaseHandler):
     @defer.inlineCallbacks
     def do_remotely_reject_invite(self, target_hosts, room_id, user_id, content):
         origin, event, event_format_version = yield self._make_and_verify_event(
-            target_hosts, room_id, user_id, "leave", content=content,
+            target_hosts, room_id, user_id, "leave", content=content
         )
         # Mark as outlier as we don't have any state for this event; we're not
         # even in the room.