Question: The following Linked List deletion code has not been tested on some edge cases. Which edge cases does it fail? def delete _ last _

The following Linked List deletion code has not been tested on some edge cases. Which edge cases does it fail?
def delete_last_element(self):
current_ptr = self.head
while current_ptr.next_ptr.next_ptr is not None:
current_ptr = current_ptr.next_ptr
current_ptr.next_ptr = None

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