diff --git a/src/layouts/entry-page/entry-page.vue b/src/layouts/entry-page/entry-page.vue
index d1890d70..22f87315 100644
--- a/src/layouts/entry-page/entry-page.vue
+++ b/src/layouts/entry-page/entry-page.vue
@@ -65,7 +65,7 @@ export default {
                             const signature = queryStringParams.signature;
 
                             const vsigResp = await validateISSClientSignature(clientTag, token, signature);
-                            this.mainStore.issConfig.isAuthenticated = vsigResp?.data.valid ?? false;
+                            this.mainStore.issConfig.isAuthenticated = vsigResp?.data?.valid ?? false;
 
                             if (this.mainStore.issConfig.isAuthenticated) {
                                 authorized = true;