[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT 
	`b24connector_button_site`.`ID` AS `ID`,
	`b24connector_button_site`.`BUTTON_ID` AS `BUTTON_ID`,
	`b24connector_button_site`.`SITE_ID` AS `SITE_ID`
FROM `b_b24connector_button_site` `b24connector_button_site` 

/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:149
#0: Bitrix\Main\DB\MysqliConnection->queryInternal
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:331
#1: Bitrix\Main\DB\Connection->query
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:3557
#2: Bitrix\Main\ORM\Query\Query->query
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:952
#3: Bitrix\Main\ORM\Query\Query->exec
	/home/bitrix/www/bitrix/modules/main/lib/orm/data/datamanager.php:513
#4: Bitrix\Main\ORM\Data\DataManager::getList
	/home/bitrix/www/bitrix/modules/b24connector/lib/buttonsitetable.php:63
#5: Bitrix\B24connector\ButtonSiteTable::getAllRestrictions
	/home/bitrix/www/bitrix/modules/b24connector/lib/helper.php:132
#6: Bitrix\B24Connector\Helper::onBeforeProlog
	/home/bitrix/www/bitrix/modules/main/tools.php:4741
#7: ExecuteModuleEventEx
	/home/bitrix/www/bitrix/modules/main/include.php:518
#8: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:19
#9: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#10: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#11: require(string)
	/home/bitrix/www/catalog/index.php:1
#12: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:184
#13: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2
----------

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:149 Stack trace: #0 /home/bitrix/www/bitrix/modules/main/lib/db/mysqlcommonconnection.php(89): Bitrix\Main\DB\MysqliConnection->queryInternal() #1 /home/bitrix/www/bitrix/modules/main/lib/db/connection.php(819): Bitrix\Main\DB\MysqlCommonConnection->getTableFields() #2 /home/bitrix/www/bitrix/modules/main/lib/db/sqlhelper.php(436): Bitrix\Main\DB\Connection->getTableField() #3 /home/bitrix/www/bitrix/modules/main/lib/orm/data/datamanager.php(1674): Bitrix\Main\DB\SqlHelper->prepareAssignment() #4 /home/bitrix/www/bitrix/modules/main/lib/session/handlers/databasesessionhandler.php(60): Bitrix\Main\ORM\Data\DataManager::delete() #5 /home/bitrix/www/bitrix/modules/main/lib/session/handlers/databasesessionhandler.php(38): Bitrix\Main\Session\Handlers\DatabaseSessionHandler->processDestroy() #6 /home/bitrix/www/bitrix/modules/main/lib/session/handlers/abstractsessionhandler.php(88): Bitrix\Main\Session\Handlers\DatabaseSessionHandler->processWrite() #7 [internal function]: Bitrix\Main\Session\Handlers\AbstractSessionHandler->write() #8 [internal function]: session_write_close() #9 {main} thrown in /home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php on line 149