diff --git a/src/PollOption.php b/src/PollOption.php
index 5bbd0475..422a3ee4 100755
--- a/src/PollOption.php
+++ b/src/PollOption.php
@@ -18,7 +18,7 @@
 /**
  * @property int            $id
  * @property string         $answer
- * @property string         $image_url
+ * @property string|null    $image_url
  * @property Poll           $poll
  * @property int            $poll_id
  * @property int            $vote_count