Error getting group information

DEBUG MODE

SQL Error : 2006 MySQL server has gone away

SELECT g.group_id, g.group_name, g.group_type,g.group_moderator, ug.user_pending FROM phpbb_groups g, phpbb_user_group ug WHERE ug.user_id = 4740 AND ug.group_id = g.group_id AND g.group_single_user <> 1 ORDER BY g.group_name, g.group_moderator, ug.user_id

Line : 567
File : usercp_viewprofile.php