How to auto banned who send spam chat, my code not work HELP

hi! I need help,, My code not work,, I want to autoban who send spam chat with loop code , here is my code

    [RPC]
     private void Chat(string content, string sender, PhotonMessageInfo info)
     {
         PhotonPlayer sender2 = info.sender;
         lastChatTime = Time.time;
         this.chatSpamCounter = 0;
         lastChatSender = info.sender.ID;
         if (info.sender.ID == this.lastChatSender)
         {
             if ((double) Time.time - (double) lastChatTime < 0.10000124340)
             {
                 GameManager gameManager = this;
                 int num1 = fengGameManagerMkii.chatSpamCounter + 1;
                 fengGameManagerMkii.chatSpamCounter = num1;
                 
                 if (num1 > 4)
                 {
                     FengGameManagerMKII.instance.kickPlayer(sender2, true, "");
                     MyConsole.ConsoleMessages.Add(" Alert!!! Player : " + sender2 + "is Trying To spam Chat");
                 }
             }
 
         }
 
             if (sender != string.Empty)
         {
             content = sender + ":" + content;
         }
         content = "<color=#FFC000>[" + Convert.ToString(info.sender.ID) + "]</color> " + content;
         this.chatRoom.addLINE(content);
     }

the problem is, " if (num > 4) " Why Not work? ,,, Pls help