diff --git a/pr_agent/algo/pr_processing.py b/pr_agent/algo/pr_processing.py
index bbe363e1..b37c3001 100644
--- a/pr_agent/algo/pr_processing.py
+++ b/pr_agent/algo/pr_processing.py
@@ -354,7 +354,7 @@ async def retry_with_fallback_models(f: Callable, model_type: ModelType = ModelT
 
 
 def _get_all_models(model_type: ModelType = ModelType.REGULAR) -> List[str]:
-    if model_type == ModelType.WEAK:
+    if get_settings().config.get('model_weak') and model_type == ModelType.WEAK:
         model = get_settings().config.model_weak
     else:
         model = get_settings().config.model