diff --git a/api/core/app/apps/workflow/app_generator.py b/api/core/app/apps/workflow/app_generator.py
index 89cdf09a8f..a18139e644 100644
--- a/api/core/app/apps/workflow/app_generator.py
+++ b/api/core/app/apps/workflow/app_generator.py
@@ -221,7 +221,7 @@ class WorkflowAppGenerator(BaseAppGenerator):
 
         # release database connection, because the following new thread operations may take a long time
         db.session.close()
-        
+
         worker_thread = threading.Thread(
             target=self._generate_worker,
             kwargs={