diff --git a/Source/Chatbook/LLMUtilities.wl b/Source/Chatbook/LLMUtilities.wl
index ac653d6e..c4b5581b 100644
--- a/Source/Chatbook/LLMUtilities.wl
+++ b/Source/Chatbook/LLMUtilities.wl
@@ -9,7 +9,7 @@ Needs[ "Wolfram`Chatbook`Common`" ];
 (* ::**************************************************************************************************************:: *)
 (* ::Section::Closed:: *)
 (*Configuration*)
-$llmSynthesizeAuthentication := If[ TrueQ @ $llmKit, "LLMKit", Automatic ];
+$llmSynthesizeAuthentication := If[ TrueQ @ $llmKit && StringQ @ $llmKitService, "LLMKit", Automatic ];
 
 $defaultLLMSynthesizeEvaluator :=
     If[ TrueQ @ $llmKit && StringQ @ $llmKitService,