[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (1040) Too many connections (400)
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/home/bitrix/www/bitrix/modules/main/lib/data/connection.php:53
#1: Bitrix\Main\Data\Connection->getResource()
	/home/bitrix/www/bitrix/modules/main/lib/db/mysqlisqlhelper.php:21
#2: Bitrix\Main\DB\MysqliSqlHelper->forSql(string, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/sqlhelper.php:466
#3: Bitrix\Main\DB\SqlHelper->convertToDbString(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/stringfield.php:73
#4: Bitrix\Main\Entity\StringField->convertValueToDb(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query/filter/conditiontree.php:582
#5: Bitrix\Main\Entity\Query\Filter\ConditionTree->convertValue(string, object)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query/filter/conditiontree.php:473
#6: Bitrix\Main\Entity\Query\Filter\ConditionTree->getSql(array)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:1792
#7: Bitrix\Main\Entity\Query->buildWhere()
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:1990
#8: Bitrix\Main\Entity\Query->buildQuery()
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:758
#9: Bitrix\Main\Entity\Query->exec()
	/home/bitrix/www/bitrix/modules/highloadblock/lib/highloadblock.php:347
#10: Bitrix\Highloadblock\HighloadBlockTable::compileEntity(string)
	/home/bitrix/www/local/php_interface/events/system.php:59
#11: require_once(string)
	/home/bitrix/www/local/php_interface/init.php:138
#12: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include.php:233
#13: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#14: require_once(string)
	/home/bitrix/www/bitrix/rk.php:7