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-rw-r--r--synapse/handlers/sync.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 3b89582d79..5307b62b85 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -637,6 +637,9 @@ class SyncHandler(object):
         )
         presence.extend(states)
 
+        # Deduplicate the presence entries so that there's at most one per user
+        presence = {p["content"]["user_id"]: p for p in presence}.values()
+
         presence = sync_config.filter_collection.filter_presence(
             presence
         )