diff --git a/app/store/chat.ts b/app/store/chat.ts
index 9b603902..269cc4a3 100644
--- a/app/store/chat.ts
+++ b/app/store/chat.ts
@@ -195,7 +195,7 @@ export const useChatStore = createPersistStore(
         });
       },
 
-      newSession(mask: Mask) {
+      newSession(mask?: Mask) {
         const session = createEmptySession();
 
         if (mask) {