diff --git a/e2e/client/specs/users_spec.ts b/e2e/client/specs/users_spec.ts
index b38e87e9f1..dfc2d5cc80 100644
--- a/e2e/client/specs/users_spec.ts
+++ b/e2e/client/specs/users_spec.ts
@@ -47,10 +47,6 @@ describe('users', () => {
             element(by.css('.modal__dialog .btn--primary')).click();
             browser.sleep(2000); // wait for reload
 
-            // close "missing categories" vocabulary warning
-            // most likely it appears because refreshing the page causes test data to disappear
-            element(by.css('.p-dialog-header-icons')).click();
-
             const header = element(by.css('[ng-hide="currentRoute.topTemplateUrl"]'));
 
             browser.wait(ECE.presenceOf(header), 1000);
diff --git a/scripts/validate-instance-configuration.tsx b/scripts/validate-instance-configuration.tsx
index 8a0a2b53b9..f8a3218caf 100644
--- a/scripts/validate-instance-configuration.tsx
+++ b/scripts/validate-instance-configuration.tsx
@@ -16,7 +16,7 @@ export function maybeDisplayInvalidInstanceConfigurationMessage() {
     const issues: Array<React.ReactNode> = [];
 
     ng.get('vocabularies').getAllActiveVocabularies().then((vocabularies) => {
-        const categoriesMissing = vocabularies.find(({_id}) => _id === 'categories') != null;
+        const categoriesMissing = vocabularies.find(({_id}) => _id === 'categories') == null;
 
         if (categoriesMissing) {
             issues.push(