Runtime error for my Morris solution which runs properly on my machine

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    My code is like below and I encountered runtime error: Last executed input: {1,2}.
    This code can run without problem on my machine, passing many test cases including this one. I really hope someone could help me find out the bug. Thanks!

    //Morris preorder traversal, O(n) time and O(1) space
        vector<int> preorderTraversal(TreeNode* root) {
            vector<int> results;
            TreeNode* cur = root;
            while(cur) {
                if (cur->left == NULL) {
                    cur = cur->right;
                } else {
                    TreeNode* node = cur->left;
                    while (node->right && node->right != cur)
                        node = node->right;
                    if (node->right == NULL) {
                        node->right = cur;
                        cur = cur->left;
                    } else if (node->right == cur) {
                        node->right == NULL;
                        cur = cur->right;
            return results;

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