C#, Can anyone please tell me what's wrong with this? Why do i get Runtime Error for input {-1,-1}

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    public RandomListNode CopyRandomList(RandomListNode head) {
            if (head == null) return head;
            var newNode = new RandomListNode(head.label)
               next = CopyRandomList(head.next),
               random = CopyRandomList(head.random)
            return newNode;

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