diff --git a/src/tree.py b/src/tree.py
index 25593b310bf2d8388fd6b05937f3ecfa09d4df75..603a2052e429ee904786e3a789109815a3a8c851 100644
--- a/src/tree.py
+++ b/src/tree.py
@@ -239,19 +239,25 @@ class TreeWalker:
             config = load_json(config_path)
             flag, result = self.ensure_node_id(config)
             if flag:
-                dump_json(config_path, config, exist_ok=True, override=True)
+                dump_json(config_path, result, exist_ok=True, override=True)
         return config
 
     def ensure_node_id(self, config):
+        flag = False
         if "node_id" not in config or \
                 not config["node_id"].startswith(f"{self.tree}-") or \
                 config["node_id"] in id_set:
             new_id = self.gen_node_id()
             id_set.add(new_id)
             config["node_id"] = new_id
-            return True, config
-        else:
-            return False, config
+            flag = True
+
+        for child in config.get("children", []):
+            child_node = list(child.values())[0]
+            f, _ = self.ensure_node_id(child_node)
+            flag = flag or f
+
+        return flag, config
 
     def gen_node_id(self):
         return f"{self.name}-{uuid.uuid4().hex}"