fixed login as admin

app/Http/Controllers/AppSessionController.php

@@ -287,9 +287,9 @@ class AppSessionController extends Controller
         }
     }
 
-    public function loginWithSessionKey($sessionKey, $appAccessUID, Request $request){
+    public function loginWithSessionKey($sessionKey, $appAccessUID = null, Request $request){
         $url = "/api/session/pro_log_in_with_session_key/${sessionKey}";
-        if(!!$appAccessUID) {
+        if($appAccessUID) {
             $url .= "/$appAccessUID";
         }
         $api = new Backend();