diff --git a/pairent_frontend_react/src/API/User.js b/pairent_frontend_react/src/API/User.js
index d48ee9b..1bed60c 100644
--- a/pairent_frontend_react/src/API/User.js
+++ b/pairent_frontend_react/src/API/User.js
@@ -22,7 +22,7 @@ class IAPIObject {
     static storage_key = undefined;
 
     static _checkStorageSupport() {
-        if (storage_key === undefined) {
+        if (this.storage_key === undefined) {
             throw Error('This doesn\'t support local storage');
         }
     }
@@ -40,14 +40,18 @@ class IAPIObject {
     /** @returns {ThisType} */
     static restoreFromLocalStorage() {
         _checkStorageSupport();
-        if (!window.localStorage.getItem(storage_key))
+        if (!window.localStorage.getItem(this.storage_key))
             return false;
-        return new APIToken(window.localStorage.getItem(storage_key));
+        return new APIToken(window.localStorage.getItem(this.storage_key));
     }
 
     /** @returns {boolean} */
     static isCached() {
-        _checkStorageSupport();
+        this._checkStorageSupport();
+        if (window.localStorage.getItem(this.storage_key)) {
+            return true;
+        }
+        return false;
     }
 
     /**