MySQL server has gone away

-- list all mandatory documents with their latest accept state for a user SELECT cm.*, r.id as id, r . course, r.name, r.summary, r.alltext, ua.id as ua_id, UNIX_TIMESTAMP(ua.time) as ua_time, ua.name as ua_name, ua.ip as ua_ip, 'resource' as modname, cm.id as cmid, cm.visible as cmvisible FROM mdl_course_sections cs join mdl_course_modules cm ON cm.section = cs.id join mdl_resource r ON r.id = cm.instance left outer join mdl_user_accept ua ON ua.instanceid = cm.id and ua.userid = 1 where cs.course = 16 and cs.section = 2 and cm.module = 13 and cm.visible <> 0

• line 692 of lib\dmllib.php: call to debugging()
• line 974 of lib\dmllib.php: call to get_recordset_sql()
• line 7228 of lib\weblib.php: call to get_records_sql()
• line 7254 of lib\weblib.php: call to getDocs2beAccepted()
• line 49 of theme\innovaphone\footer.html: call to getLinks2beAccepted()
• line 3080 of lib\weblib.php: call to include()
• line 244 of mod\forum\discuss.php: call to print_footer()