Did something similar but just changed around the checks, unfortunatley I keep hitting a null pointer and I'm unsure why. Any thoughts?

boolean hasCycle(Node head) {

if(head==null){
    return false;
}

Node Fast = head.next; Node Slow = head;

while(Fast.next != null || Fast != null){

   if(Fast == Slow){
       return true;
   }
   Fast = Fast.next.next;
   Slow = Slow.next;

}

return false;

}

P.S. Unfortunatley I can't seem to remember how to set which language I'm using on my comment