diff --git a/frontend-js/src/main/js/map/data/PrivilegeType.js b/frontend-js/src/main/js/map/data/PrivilegeType.js
index 622c6dcf60718dd64bf8f47fe98094a68bea9798..c720cda2dc774091f76fc26474f607cf109db497 100644
--- a/frontend-js/src/main/js/map/data/PrivilegeType.js
+++ b/frontend-js/src/main/js/map/data/PrivilegeType.js
@@ -50,7 +50,7 @@ PrivilegeType.prototype.setObjectType = function (objectType) {
 
 /**
  *
- * @returns {string}
+ * @returns {?null|string}
  */
 PrivilegeType.prototype.getObjectType = function () {
   return this._objectType;