DB query error. Please try later.

Fatal error: Uncaught Bitrix\Main\DB\SqlQueryException: Mysql query error: (2006) MySQL server has gone away in /home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:137 Stack trace: #0 /home/bitrix/www/bitrix/modules/main/lib/db/connection.php(330): Bitrix\Main\DB\MysqliConnection->queryInternal('SELECT 'x' FROM...', Array, NULL) #1 /home/bitrix/www/bitrix/modules/main/lib/eventmanager.php(186): Bitrix\Main\DB\Connection->query('SELECT 'x' FROM...') #2 /home/bitrix/www/bitrix/modules/main/lib/eventmanager.php(157): Bitrix\Main\EventManager->registerEventHandlerInternal('sale', 'OnSaleCancelOrd...', 'tcsbank.kupivkr...', 'CTCSBank', 'OnCancelOrder', 100, '', '', 1) #3 /home/bitrix/www/bitrix/modules/main/classes/general/module.php(507): Bitrix\Main\EventManager->registerEventHandlerCompatible('sale', 'OnSaleCancelOrd...', 'tcsbank.kupivkr...', 'CTCSBank', 'OnCancelOrder', 100, '', Array) #4 /home/bitrix/www/bitrix/modules/tcsbank.kupivkredit/general/tcsbank.php(13): RegisterModuleDependences('sale', 'OnSaleCanc in /home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php on line 137