diff --git a/src/backend/base/langflow/custom/custom_component/custom_component.py b/src/backend/base/langflow/custom/custom_component/custom_component.py
index aa2f7bff4..c9bc1bfdf 100644
--- a/src/backend/base/langflow/custom/custom_component/custom_component.py
+++ b/src/backend/base/langflow/custom/custom_component/custom_component.py
@@ -91,7 +91,7 @@ class CustomComponent(BaseComponent):
         except Exception as e:
             raise ValueError(f"Error updating state: {e}")
 
-    def stop(self, output_name: str | None):
+    def stop(self, output_name: str | None = None):
         if not output_name and self.vertex and len(self.vertex.outputs) == 1:
             output_name = self.vertex.outputs[0]["name"]
         else: