clarified pullUpdate naming and added an error catch.

Assets/Scripts/GameLobby/Game/LocalLobby.cs

     {
         Dictionary<string, LobbyUser> m_LobbyUsers = new Dictionary<string, LobbyUser>();
         public Dictionary<string, LobbyUser> LobbyUsers => m_LobbyUsers;
-        public bool pullUpdate;
+        public bool canPullUpdate;
         #region LocalLobbyData
 
         public struct LobbyData

Assets/Scripts/GameLobby/Lobby/LobbyAsyncRequests.cs

 
         void EndListening()
         {
+            if (m_lobbySubscription == null)
+            {
+                Debug.LogError("Can't End listening without first listening to the lobby Callbacks.");
+                return;
+            }
             m_lobbySubscription.UnsubscribeAsync();
             m_RemoteLobby = null;
             m_lobbySubscription = null;

Assets/Scripts/GameLobby/Lobby/LobbyContentUpdater.cs

                 return;
             }
 
-            if (changed.pullUpdate)
+            if (changed.canPullUpdate)
-                changed.pullUpdate = false;
+                changed.canPullUpdate = false;
                 return;
             }
 
 
         void OnRemoteLobbyUpdated(Lobby lobby)
         {
-            m_LocalLobby.pullUpdate = true;
+            m_LocalLobby.canPullUpdate = true;
 
             //synching our local lobby
             LobbyConverters.RemoteToLocal(lobby, m_LocalLobby);