diff --git a/lib/core/src/lib/notifications/services/notification.service.spec.ts b/lib/core/src/lib/notifications/services/notification.service.spec.ts
index 93f4fb3c0e..c04ea2df8d 100644
--- a/lib/core/src/lib/notifications/services/notification.service.spec.ts
+++ b/lib/core/src/lib/notifications/services/notification.service.spec.ts
@@ -228,7 +228,7 @@ describe('NotificationService', () => {
         fixture.detectChanges();
 
         expect(document.querySelector('.custom-template-class')).not.toBeNull();
-        expect(document.querySelector('.custom-template-class').innerHTML).toEqual('Custom content with templateRef');
+        expect(document.querySelector('.custom-template-class')?.innerHTML).toEqual('Custom content with templateRef');
     });
 
     it('should open a message notification bar with action and custom templateRef configuration', (done) => {
@@ -240,7 +240,7 @@ describe('NotificationService', () => {
         fixture.detectChanges();
 
         expect(document.querySelector('.custom-template-class')).not.toBeNull();
-        expect(document.querySelector('.custom-template-class').innerHTML).toEqual('Custom content with templateRef');
+        expect(document.querySelector('.custom-template-class')?.innerHTML).toEqual('Custom content with templateRef');
     });
 
 });