MySQL error in file: /engine/modules/functions.php at line 756

Error Number: 2006

The Error returned was:
MySQL server has gone away

SQL query:

SELECT p.id, p.autor, p.date, p.short_story, CHAR_LENGTH(p.full_story) as full_story, p.xfields, p.title, p.category, p.alt_name, p.comm_num, p.allow_comm, p.fixed, p.tags, e.news_read, e.allow_rate, e.rating, e.vote_num, e.votes, e.view_edit, e.editdate, e.editor, e.reason FROM erdenet_post p LEFT JOIN erdenet_post_extras e ON (p.id=e.news_id) WHERE category regexp '[[:<:]](1|2|3|4|5|6|7|8|9|11|13|14|15|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31|32|33|34|35|36|37)[[:>:]]' AND approve=1 AND date < '2019-11-12 19:03:01' ORDER BY date DESC LIMIT 0,20