MySQL error in file: /engine/modules/number.comp.php at line 9

Error Number: 2006

The Error returned was:
MySQL server has gone away

SQL query:

SELECT COUNT(*) as count FROM dle_post WHERE `category` regexp "\b(1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31|32|33|34|35|36|37|38|39|40|41|42|43|44|45|46|47|48|49|50|51|52|53|54|55|56|57|58|59|60|61|62|63|64|65|66|67|68|69|70)\b"