Cannot delete user

[Nirjonadda]

while deleting user, getting error message, though user is being deleted. please let me know, how to fixing this issue?

Fatal error: Call to a member function query_write() on null in /home/user/public_html/vbtt/hooks/userdata_delete.php on line 3

userdata_delete.php code are:

<?php

$this->dbobject->db->query_write("
    DELETE FROM vbtt_users WHERE uid = " . $this->existing['userid']
);

$this->dbobject->query_write("
    UPDATE vbtt_files_users SET uid = 0
    WHERE uid = " . $this->existing['userid'] . "
");

[Lynne]

That is from a modification. You will need to ask in the modification thread for help with the issue.