diff --git a/admin/admin_forums.php b/admin/admin_forums.php
index fdabcea8..a67f4009 100644
--- a/admin/admin_forums.php
+++ b/admin/admin_forums.php
@@ -554,6 +554,11 @@ if ($mode)
 			$from_id = (int) $_POST['from_id'];
 			$to_id   = (int) isset($_POST['to_id']) ? $_POST['to_id'] : -1;
 
+			if ($to_id == -1)
+			{
+				bb_die($lang['NOWHERE_TO_MOVE']);
+			}
+
 			if ($from_id == $to_id || !cat_exists($from_id) || !cat_exists($to_id))
 			{
 				bb_die('Bad input');