Why it does not work?

Why it does not work?
when the player executes "/ cps on" starts the task
when you run "/ cps off" it cancels the task
Can someone help me please?

- Sorry for my bad English

PHP:

      public $cps = false;
                 // MAIN
              case "cps":
            if(!isset($args[0])){
                if ($sender instanceof Player) {
    $sender->sendMessage("§e§lUSO: §r§e/cps§7 <on/off>");
      
         } else {
$sender->sendMessage("§cUse o comando dentro do jogo!");
}
         } else {

                if($args[0] == "on"){
$this->getScheduler()->scheduleRepeatingTask(new BMsg($this, $sender), 1);
                    $sender->sendMessage("§e§lMOD: §r§eCPS ativado com sucesso!");

            } elseif ($args[0] == "off"){
                    $sender->sendMessage("§e§lMOD: §r§eCPS desligado com sucesso!");     
                 $this->cps = false;
      }           
    } 

PHP:

 // TASK
    public function onRun(int $currentTick)
    {    
        $cps = $this->plugin->getClicks($this->player);   
         $this->player->sendTip("§eCPS:§7 {$cps}");           
     if($this->plugin->cps = false){
    $this->plugin->getScheduler()->cancelTask($this->getTaskId());
}
}
}

 

In if you used one =. You must use == (in your task)