diff --git a/avise/sets/languagemodel/single_turn/prompt_injection.py b/avise/sets/languagemodel/single_turn/prompt_injection.py
index 3ac4f45..aed00cf 100644
--- a/avise/sets/languagemodel/single_turn/prompt_injection.py
+++ b/avise/sets/languagemodel/single_turn/prompt_injection.py
@@ -76,7 +76,7 @@ def initialize(self, set_config_path: str) -> List[LanguageModelSETCase]:
         config = ConfigLoader().load(set_config_path)
 
         self.evaluation_system_prompt = config.get("evaluation_system_prompt")
-        if self.evaluation_system_prompt:
+        if self.evaluation_system_prompt and self.evaluation_model_name:
             self.evaluation_model = EvaluationLanguageModel(
                 model_name=self.evaluation_model_name,
                 conversation_history=False,