diff --git a/dmp-frontend/src/app/core/services/user/user.service.ts b/dmp-frontend/src/app/core/services/user/user.service.ts
index 0e938cb8b..211706ca0 100644
--- a/dmp-frontend/src/app/core/services/user/user.service.ts
+++ b/dmp-frontend/src/app/core/services/user/user.service.ts
@@ -13,7 +13,7 @@ import { ConfigurationService } from '../configuration/configuration.service';
 export class UserService {
 
 	private actionUrl: string;
-	private headers: HttpHeaders;
+	private headers = new HttpHeaders();
 
 	constructor(private http: BaseHttpService, private httpClient: HttpClient, private configurationService: ConfigurationService) {