diff --git a/src/renderer/src/hooks/useAssistant.ts b/src/renderer/src/hooks/useAssistant.ts
index db34bda9..b99074c7 100644
--- a/src/renderer/src/hooks/useAssistant.ts
+++ b/src/renderer/src/hooks/useAssistant.ts
@@ -71,8 +71,8 @@ export function useAssistant(id: string) {
     updateTopics: (topics: Topic[]) => dispatch(updateTopics({ assistantId: assistant.id, topics })),
     removeAllTopics: () => dispatch(removeAllTopics({ assistantId: assistant.id })),
     setModel: useCallback(
-      (model: Model) => dispatch(setModel({ assistantId: assistant.id, model })),
-      [dispatch, assistant.id]
+      (model: Model) => assistant && dispatch(setModel({ assistantId: assistant?.id, model })),
+      [assistant, dispatch]
     ),
     updateAssistant: (assistant: Assistant) => dispatch(updateAssistant(assistant)),
     updateAssistantSettings: (settings: Partial<AssistantSettings>) => {