MySQL server has gone away

[237] zb_system/function/lib/database/mysqli.php

Fatal error: Uncaught mysqli_sql_exception: MySQL server has gone away in /fenzhan1/guohua/zb_system/function/lib/database/mysqli.php:237 Stack trace: #0 /fenzhan1/guohua/zb_system/function/lib/database/mysqli.php(237): mysqli_query() #1 /fenzhan1/guohua/zb_users/plugin/fast/function.php(39): Database__MySQLi->Query() #2 [internal function]: {closure}() #3 {main} thrown in /fenzhan1/guohua/zb_system/function/lib/database/mysqli.php on line 237