diff --git a/src/core/review_engine.py b/src/core/review_engine.py
index 6fb9eaf..e398387 100644
--- a/src/core/review_engine.py
+++ b/src/core/review_engine.py
@@ -331,7 +331,7 @@ class ReviewEngine:
                 continue
 
             file_language = language
-            if not file_language and self.repo:
+            if not file_language and self.repo is not None:
                 file_language = self.repo.get_file_language(file_change.filename)
 
             prompt = ReviewPromptTemplates.get_prompt(