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-rw-r--r--synapse/handlers/federation.py9
1 files changed, 7 insertions, 2 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 6cb2f73ff4..a03a5f494c 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -234,8 +234,13 @@ class FederationHandler(BaseHandler):
 
         if event.type == EventTypes.Member:
             if event.membership == Membership.JOIN:
-                user = UserID.from_string(event.state_key)
-                yield user_joined_room(self.distributor, user, event.room_id)
+                context = yield self.state_handler.compute_event_context(
+                    event, old_state=state, outlier=event.internal_metadata.is_outlier()
+                )
+                prev_state = context.current_state.get((event.type, event.state_key))
+                if not prev_state or prev_state.membership != Membership.JOIN:
+                    user = UserID.from_string(event.state_key)
+                    yield user_joined_room(self.distributor, user, event.room_id)
 
     @defer.inlineCallbacks
     def _filter_events_for_server(self, server_name, room_id, events):