plugin XEP-0045: fixed message type filtering when getting last stanza_id to retrieve history with MAM

sat/plugins/plugin_xep_0045.py

@@ -890,12 +890,15 @@ class SatMUCClient(muc.MUCClient):
         room._history_type = HISTORY_MAM
         room._history_d = defer.Deferred()
 
-        last_mess = yield self.host.memory.historyGet(room_jid,
-                                                      None,
-                                                      limit=1,
-                                                      between=False,
-                                                      filters={u'last_stanza_id': True},
-                                                      profile=client.profile)
+        last_mess = yield self.host.memory.historyGet(
+            room_jid,
+            None,
+            limit=1,
+            between=False,
+            filters={
+                u'types': C.MESS_TYPE_GROUPCHAT,
+                u'last_stanza_id': True},
+            profile=client.profile)
         if last_mess:
             stanza_id = last_mess[0][-1][u'stanza_id']
             rsm_req = rsm.RSMRequest(max_=100, after=stanza_id)