Added code not functioning

So I was working on a custom potion and I wanted to change the tick interval between when the potion triggers so I edited it in the code editor. I replaced this code

		@Override
		public boolean isReady(int duration, int amplifier) {
			return true;
		}

With this

		public boolean isReady(int duration, int amplifier) {
	int k = 2 >> amplifier; 
	if (k > 0)
		return duration % k == 0;
	else
		return true;
}

it worked first try but as soon as I reloaded Mcreator the potion ceased to have any function whatsoever. I'm not sure what I did wrong and I don't know how to fix it. Does anybody know how to fix this?