diff --git a/expo/MCTS.py b/expo/MCTS.py
index 265356f65..ef408b2dd 100644
--- a/expo/MCTS.py
+++ b/expo/MCTS.py
@@ -148,7 +148,7 @@ class Node:
         role = role.model_copy()
         role.save_state(static_save=True)
 
-    async def expand(self, max_children):
+    async def expand(self, max_children, use_fixed_insights):
         if self.is_fully_expanded():
             return
         insight_geneartor = InstructionGenerator()
@@ -159,7 +159,7 @@ class Node:
             original_instruction=original_instruction,
             max_num=max_children,
             file_path=self.state["exp_pool_path"],
-            use_fixed_insights=self.use_fixed_insights,
+            use_fixed_insights=use_fixed_insights,
         )
         new_state = self.state.copy()
         new_state["start_task_id"] += 1
@@ -259,7 +259,7 @@ class MCTS:
         return max(all_children, key=uct)
 
     async def expand(self, node: Node, max_children=5):
-        await node.expand(max_children)
+        await node.expand(max_children, self.use_fixed_insights)
         if node not in self.children or not self.children[node]:
             self.children[node] = node.children
         return node.children