handle none case

ehdgua01 · Nov 5, 2024 · c73d9cd · c73d9cd
1 parent ca8ea07
commit c73d9cd
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/coding_test/leetcode/binary_tree_paths/test.py b/coding_test/leetcode/binary_tree_paths/test.py
@@ -28,7 +28,8 @@ def backtrack(node: TreeNode):
                 backtrack(node.right)
                 stack.pop()
 
-        backtrack(root)
+        if root is not None:
+            backtrack(root)
         return result