diff --git a/api/controllers/service_api/app/workflow.py b/api/controllers/service_api/app/workflow.py
index b2148f4fa1..35dd22c801 100644
--- a/api/controllers/service_api/app/workflow.py
+++ b/api/controllers/service_api/app/workflow.py
@@ -132,6 +132,8 @@ class WorkflowRunDetailApi(Resource):
             app_id=app_model.id,
             run_id=workflow_run_id,
         )
+        if not workflow_run:
+            raise NotFound("Workflow run not found.")
         return workflow_run