fix: Clears Lobby room instance and resets joined flag.

modules/xmpp/ChatRoom.js

@@ -1676,6 +1676,8 @@ export default class ChatRoom extends Listenable {
     clean() {
         this._removeConnListeners.forEach(remove => remove());
         this._removeConnListeners = [];
+
+        this.joined = false;
     }
 
     /**

modules/xmpp/Lobby.js

@@ -199,6 +199,8 @@ export default class Lobby {
                         .forEach(j => this.mainRoom.eventEmitter.emit(
                             XMPPEvents.MUC_LOBBY_MEMBER_LEFT, Strophe.getResourceFromJid(j)));
 
+                    this.lobbyRoom.clean();
+
                     this.lobbyRoom = undefined;
                     logger.info('Lobby room left(destroyed)!');
                 });
@@ -239,6 +241,8 @@ export default class Lobby {
                         return;
                     }
 
+                    this.lobbyRoom.clean();
+
                     this.mainRoom.eventEmitter.emit(XMPPEvents.MUC_DESTROYED, reason);
                 });