Hi, i have a TickEvent.PlayerTickEvent event(by the way the class of the events works correctly) im using this because is like a loop, im trying to detect an item: if(stack.getItem().equals(ModItems.MYITEM)) and it throws the invalid hand null

@SubscribeEvent
    public static void testEvent(TickEvent.PlayerTickEvent event)
    {
        PlayerEntity player = event.player;
        World world = event.player.world;
        ItemStack stack = player.getHeldItem(player.getActiveHand());
        if(stack.getItem().equals(ModItems.MYITEM))
        {
            //dosomething
        }
    }

minecraft crashes when the world is loaded...

 

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