Fix an error which was thrown by the PresenceHandler _on_shutdown handler.

changelog.d/6640.bugfix

@@ -0,0 +1 @@
+Fix an error which was thrown by the PresenceHandler _on_shutdown handler.

synapse/handlers/presence.py

@@ -95,12 +95,7 @@
 
 
 class PresenceHandler(object):
-    def __init__(self, hs):
-        """
-
-        Args:
-            hs (synapse.server.HomeServer):
-        """
+    def __init__(self, hs: "synapse.server.HomeServer"):
         self.hs = hs
         self.is_mine = hs.is_mine
         self.is_mine_id = hs.is_mine_id
@@ -230,7 +225,7 @@ def _on_shutdown(self):
         is some spurious presence changes that will self-correct.
         """
         # If the DB pool has already terminated, don't try updating
-        if not self.store.database.is_running():
+        if not self.store.db.is_running():
             return
 
         logger.info(