diff --git a/request_llms/bridge_all.py b/request_llms/bridge_all.py
index 9a12f984..d5057cea 100644
--- a/request_llms/bridge_all.py
+++ b/request_llms/bridge_all.py
@@ -1011,7 +1011,7 @@ import importlib
 import core_functional
 def execute_model_override(llm_kwargs, additional_fn, method):
     functional = core_functional.get_core_functions()
-    if 'ModelOverride' in functional[additional_fn]:
+    if (additional_fn in functional) and 'ModelOverride' in functional[additional_fn]:
         # 热更新Prompt & ModelOverride
         importlib.reload(core_functional)
         functional = core_functional.get_core_functions()