Fix null value for item.parent column

diff --git a/mod/item.php b/mod/item.php
index d70353d..2e5560f 100644 (file)
--- a/mod/item.php
+++ b/mod/item.php
@@ -105,7 +105,7 @@ function item_post(App $a) {
 
        $parent_item = null;
        $toplevel_item = null;
-       $toplevel_item_id = null;
+       $toplevel_item_id = 0;
        $toplevel_user_id = null;
 
        $objecttype = null;