diff --git a/tabby/server/backend/python.py b/tabby/server/backend/python.py
index 7813c0f..4d744a3 100644
--- a/tabby/server/backend/python.py
+++ b/tabby/server/backend/python.py
@@ -43,7 +43,7 @@ class PythonModelService:
         )
 
     def generate(self, request: CompletionRequest) -> List[Choice]:
-        preset = LanguagePresets.get(data.language, None)
+        preset = LanguagePresets.get(request.language, None)
         if preset is None:
             return []