[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2006) MySQL server has gone away (400)
/home/bitrix/ext_www/vivat-book.com.ua/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/home/bitrix/ext_www/vivat-book.com.ua/bitrix/modules/main/lib/data/connection.php:53
#1: Bitrix\Main\Data\Connection->getResource()
	/home/bitrix/ext_www/vivat-book.com.ua/bitrix/modules/main/lib/db/mysqlisqlhelper.php:21
#2: Bitrix\Main\DB\MysqliSqlHelper->forSql(string)
	/home/bitrix/ext_www/vivat-book.com.ua/bitrix/modules/main/lib/eventmanager.php:137
#3: Bitrix\Main\EventManager->unRegisterEventHandler(string, string, string, string, string)
	/home/bitrix/ext_www/vivat-book.com.ua/local/php_interface/eventHandlers.php:18
#4: include(string)
	/home/bitrix/ext_www/vivat-book.com.ua/local/php_interface/init.php:20
#5: include_once(string)
	/home/bitrix/ext_www/vivat-book.com.ua/bitrix/modules/main/include.php:241
#6: require_once(string)
	/home/bitrix/ext_www/vivat-book.com.ua/bitrix/modules/main/include/prolog_before.php:14
#7: require_once(string)
	/home/bitrix/ext_www/vivat-book.com.ua/bitrix/modules/main/include/prolog.php:10
#8: require_once(string)
	/home/bitrix/ext_www/vivat-book.com.ua/bitrix/header.php:1
#9: require(string)
	/home/bitrix/ext_www/vivat-book.com.ua/catalog/index.php:1
#10: include_once(string)
	/home/bitrix/ext_www/vivat-book.com.ua/bitrix/modules/main/include/urlrewrite.php:159
#11: include_once(string)
	/home/bitrix/ext_www/vivat-book.com.ua/bitrix/urlrewrite.php:2