[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2006) MySQL server has gone away (400)
/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/main/lib/db/mysqliconnection.php:122
#1: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/main/lib/db/connection.php:330
#2: Bitrix\Main\DB\Connection->query(string)
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/main/lib/entity/query.php:3038
#3: Bitrix\Main\Entity\Query->query(string)
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/main/lib/entity/query.php:797
#4: Bitrix\Main\Entity\Query->exec()
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/main/lib/entity/datamanager.php:290
#5: Bitrix\Main\Entity\DataManager::getList(array)
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/socialservices/lib/ap.php:96
#6: Bitrix\Socialservices\ApTable::getConnection()
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/b24connector/lib/connection.php:229
#7: Bitrix\B24Connector\Connection::getFields()
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/b24connector/lib/helper.php:125
#8: Bitrix\B24Connector\Helper::onBeforeProlog()
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/main/classes/general/module.php:490
#9: ExecuteModuleEventEx(array)
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/main/include.php:568
#10: require_once(string)
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/main/include/prolog_before.php:14
#11: require_once(string)
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/main/include/prolog.php:9
#12: require_once(string)
	/home/bitrix/ext_www/bohdan-books.com/bitrix/header.php:1
#13: require(string)
	/home/bitrix/ext_www/bohdan-books.com/catalog/index.php:2
#14: include_once(string)
	/home/bitrix/ext_www/bohdan-books.com/bitrix/modules/main/include/urlrewrite.php:159
#15: include_once(string)
	/home/bitrix/ext_www/bohdan-books.com/bitrix/urlrewrite.php:2