diff --git a/joj3_config_generator/models/result.py b/joj3_config_generator/models/result.py
index 7d3aeed..07e3f2b 100644
--- a/joj3_config_generator/models/result.py
+++ b/joj3_config_generator/models/result.py
@@ -121,7 +121,7 @@ class Parser(BaseModel):
 
 class StageDetail(BaseModel):
     name: str
-    group: Optional[str] = ""
+    group: str = ""
     executor: Executor
     parsers: List[Parser]