diff --git a/models/IssueContent.php b/models/IssueContent.php
index c469fa1..a07704e 100644
--- a/models/IssueContent.php
+++ b/models/IssueContent.php
@@ -27,6 +27,8 @@ public function canView($user = null)
     {
         if ($user === null && !\Yii::$app->user->isGuest) {
             $user = \Yii::$app->user->getIdentity();
+        } else if (!$user instanceof User) {
+            $user = User::findOne(['id' => $user]);
         }
 
         $visibility = (int)$this->visibility;