Basically I’m trying to remove consecutive duplicate numbers in a Linked List using recursion. My code is working fine for smaller size of Linked Lists but getting stackoverflow error for bigger size Linked lists. I am not able to figure out what’s the issue. Can anybody help.

/*

    Following is the Node class already written for the Linked List

    class Node<T> {
        T data;
        Node<T> next;
    
        public Node(T data) {
            this.data = data;
        }
    }

*/

public class Solution {

    public static Node<Integer> removeDuplicates(Node<Integer> head) {
        //recursive approach
        if(head==null || head.next==null){
            return head;
        }
        Node<Integer> smallAns = removeDuplicates(head.next);

        if(smallAns.data.equals(head.data)){
            return smallAns;
        }else{
            head.next = smallAns;
            return head;
        }
    }
}

Sample Input 1 :
1 2 3 3 3 3 4 4 4 5 5 7 -1
Sample Output 1 :
1 2 3 4 5 7