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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 0b780cd528..aca65096fc 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -950,7 +950,8 @@ class PresenceHandler(BaseHandler):
                 )
                 while len(self._remote_offline_serials) > MAX_OFFLINE_SERIALS:
                     self._remote_offline_serials.pop()  # remove the oldest
-                del self._user_cachemap[user]
+                if user in self._user_cachemap:
+                    del self._user_cachemap[user]
             else:
                 # Remove the user from remote_offline_serials now that they're
                 # no longer offline