Loop in Linked List error while reversing a linked list?

I'm getting a loop in linked list error while trying to reverse a linked list-

class Solution:
    def reverseList(self, head: ListNode) -> ListNode:
        
        first = head
        second = head.next
        third = head.next.next
        
        while third != None and third.next != None:
            
            third = second.next
            
            second.next = first
            first = second
            second = third

            
        print(first)
        print (second)
            
        return second
        

Output : [5]

And the error is-

Error - Found cycle in the ListNode ListNode{val: 5, next: None}