diff --git a/ng2-components/ng2-alfresco-core/src/services/AlfrescoAuthentication.service.spec.ts b/ng2-components/ng2-alfresco-core/src/services/AlfrescoAuthentication.service.spec.ts
index 4507d9542b..c43a10b753 100644
--- a/ng2-components/ng2-alfresco-core/src/services/AlfrescoAuthentication.service.spec.ts
+++ b/ng2-components/ng2-alfresco-core/src/services/AlfrescoAuthentication.service.spec.ts
@@ -54,7 +54,7 @@ describe('AlfrescoAuthentication', () => {
         });
         spyOn(localStorage, 'key').and.callFake(function (i) {
             let keys = Object.keys(store);
-            return keys[i];
+            return keys[i] || null;
         });
 
         jasmine.Ajax.install();