[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [127.0.0.1]: (2006) MySQL server has gone away (400)
/var/www/tpc/bitrix/modules/main/lib/db/mysqliconnection.php:82
#0: Bitrix\Main\DB\MysqliConnection->connectInternal
	/var/www/tpc/bitrix/modules/main/lib/data/connection.php:53
#1: Bitrix\Main\Data\Connection->getResource
	/var/www/tpc/bitrix/modules/main/classes/general/database.php:283
#2: CAllDatabase->DoConnect
	/var/www/tpc/bitrix/modules/main/classes/mysql/database_mysqli.php:85
#3: CDatabase->ForSqlLike
	/var/www/tpc/bitrix/modules/main/classes/general/filterquery.php:287
#4: CFilterQuery->BuildWhereClause
	/var/www/tpc/bitrix/modules/main/classes/general/filterquery.php:227
#5: CAllFilterQuery->PrepareQuery
	/var/www/tpc/bitrix/modules/main/classes/general/filterquery.php:65
#6: CAllFilterQuery->GetQueryString
	/var/www/tpc/bitrix/modules/main/filter_tools.php:371
#7: GetFilterQuery
	/var/www/tpc/bitrix/modules/sotbit.mailing/classes/mysql/CSotbitMailingEvent.php:117
#8: CSotbitMailingEvent::GetList
	/var/www/tpc/bitrix/modules/sotbit.mailing/classes/general/CSotbitMailingHelp.php:1540
#9: CSotbitMailingHelp::OnPageStart
	/var/www/tpc/bitrix/modules/main/classes/general/module.php:480
#10: ExecuteModuleEventEx
	/var/www/tpc/bitrix/modules/main/include.php:173
#11: require_once(string)
	/var/www/tpc/bitrix/modules/main/include/prolog_before.php:14
#12: require(string)
	/var/www/tpc/301.php:3
#13: include_once(string)
	/var/www/tpc/bitrix/modules/main/include/urlrewrite.php:174
#14: include_once(string)
	/var/www/tpc/404.php:1
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