help with a garbage value

this program is a binary tree using nodes. it should do an in-order
print, which it does. however, it inserts a garbage value at the end
of the print. ex: cin >> 1 2 3 4 5 prints 1 2 3 4 5 7884788. can
anyone help? value_type is an integer.

constructors:

       tree():data(value_type()),left(NULL), right(NULL){}

       tree(value_type vt, tree* l = NULL, tree* r = NULL):
            data(vt), left(l), right(r) {};

insert function:

      tree::tree* tree::insert(tree* node, value_type data){
        if (node == NULL){
            return(new tree(data));
        }else

            if(data <= node->data){
                node->left = insert(node->left, data);
        }else
            if(data >= node->data){
                node->right = insert(node->right, data);
            }
        return node;
    }

driver:

       int main(){

    tree t1;
    int user_input;
    tree* tree_ptr = new tree(user_input);

            while(cin >> user_input && cin.peek() != EOF){
            t1.insert(tree_ptr, user_input);
            }
            t1.inorder_print(tree_ptr);

return 0;

}