fix repeated cleanup (#399)

Co-authored-by: Nathan Habib <[email protected]>

Author: 2 people

src/lighteval/models/vllm_model.py

@@ -98,7 +98,8 @@ def tokenizer(self):
 
     def cleanup(self):
         destroy_model_parallel()
-        del self.model.llm_engine.model_executor.driver_worker
+        if self.model is not None:
+            del self.model.llm_engine.model_executor.driver_worker
         self.model = None
         gc.collect()
         ray.shutdown()