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-rw-r--r--synapse/handlers/presence.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 94160a5be7..6b70fa3817 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -406,7 +406,8 @@ class PresenceHandler(object):
             user_id for user_id, count in self.user_to_num_current_syncs.items()
             if count
         }
-        syncing_user_ids.update(self.external_process_to_current_syncs.values())
+        for user_ids in self.external_process_to_current_syncs.values():
+            syncing_user_ids.update(user_ids)
         return syncing_user_ids
 
     @defer.inlineCallbacks