diff --git a/src/backend/langflow/api/v1/base.py b/src/backend/langflow/api/v1/base.py
index acffc1bc3..b1071bea2 100644
--- a/src/backend/langflow/api/v1/base.py
+++ b/src/backend/langflow/api/v1/base.py
@@ -42,7 +42,7 @@ class CodeValidationResponse(BaseModel):
 class PromptValidationResponse(BaseModel):
     input_variables: list
     # object return for tweak call
-    frontend_node: FrontendNodeRequest | object
+    frontend_node: Optional[FrontendNodeRequest] = None
 
 
 INVALID_CHARACTERS = {