MySQL error in file: /engine/modules/categories_alphabetic.php at line 87

Error Number: 2006

The Error returned was:
MySQL server has gone away

SQL query:

SELECT id, name, alt_name, xfields FROM dle_category WHERE parentid='108' AND LOWER(SUBSTRING_INDEX(SUBSTRING_INDEX(xfields, 'ko|', -1), '|', 1)) LIKE LOWER('I%') LIMIT 75, 25