fix

common/components/BaseController.php

@@ -45,6 +45,8 @@ abstract class BaseController extends Controller
         if($request->isGet && !$request->isAjax)
         {
             Yii::$app->session->set('SessionData', [$request->url, $request->referrer]);
+        } else {
+            Yii::$app->session->set('SessionData', false);
         }
     }
 

common/modules/sessions/controllers/DefaultController.php

@@ -48,15 +48,17 @@ class DefaultController extends BaseController
             $session->save(false, ['user_id']);
         }
 
-        list($url, $referer) = Yii::$app->session->get('SessionData');
+        if(Yii::$app->session->get('SessionData')) {
+            list($url, $referer) = Yii::$app->session->get('SessionData');
 
-        $sUrl = new SessionUrl;
-        $sUrl->session_id = $session->id;
-        $sUrl->url = $url;
-        $sUrl->referer = $referer;
-        $sUrl->utm = $sUrl->isUtm();
+            $sUrl = new SessionUrl;
+            $sUrl->session_id = $session->id;
+            $sUrl->url = $url;
+            $sUrl->referer = $referer;
+            $sUrl->utm = $sUrl->isUtm();
 
-        $sUrl->save();
+            $sUrl->save();
+        }
         
         return ['success' => true];
     }