Screen.hasShiftDown() on server crash !

my code 

@Override
        public void onArmorTick(ItemStack stack, World world, PlayerEntity player) {
            if (player.isAlive() && Screen.hasShiftDown()) {      --59
                
            }
            super.onArmorTick(stack, world, player);
        }

He crashed when I was running on the server

https://paste.ubuntu.com/p/tkSGkzDB23/

Edited December 8, 20213 yr by Spring