diff --git a/htdocs/comm/action/card.php b/htdocs/comm/action/card.php
index 0b75ea73e98..044cf9908ea 100644
--- a/htdocs/comm/action/card.php
+++ b/htdocs/comm/action/card.php
@@ -215,7 +215,7 @@ if ($action == 'add')
 		$object->duree=((float) (GETPOST('dureehour') * 60) + (float) GETPOST('dureemin')) * 60;
 
 		$listofuserid=array();
-		if (! empty($_SESSION['assignedtouser'])) $listofuserid=json_decode($_SESSION['assignedtouser']);
+		if (! empty($_SESSION['assignedtouser'])) $listofuserid=json_decode($_SESSION['assignedtouser'], true);
 		$i=0;
 		foreach($listofuserid as $key => $value)
 		{