[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
DO RELEASE_LOCK('04328b5d3a93212f148cec599b20f62b')
/home/pprog/web/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/home/pprog/web/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query(string, NULL)
	/home/pprog/web/bitrix/modules/main/lib/db/connection.php:379
#2: Bitrix\Main\DB\Connection->queryExecute(string)
	/home/pprog/web/bitrix/modules/main/lib/composite/internals/locker.php:46
#3: Bitrix\Main\Composite\Internals\Locker::unlock(string)
	/home/pprog/web/bitrix/modules/main/lib/composite/engine.php:496
#4: Bitrix\Main\Composite\Engine::processPageContent(string)
	/home/pprog/web/bitrix/modules/main/lib/composite/engine.php:422
#5: Bitrix\Main\Composite\Engine::endBuffering(string, string)
	/home/pprog/web/bitrix/modules/main/classes/general/main.php:3195
#6: CAllMain->EndBufferContent(string)
	/home/pprog/web/bitrix/modules/main/classes/general/main.php:3139
#7: CAllMain->EndBufferContentMan()
	/home/pprog/web/bitrix/modules/main/include/epilog_after.php:36
#8: require(string)
	/home/pprog/web/bitrix/modules/main/include/epilog.php:3
#9: require_once(string)
	/home/pprog/web/bitrix/footer.php:4
#10: require(string)
	/home/pprog/web/en.pprog.ru/public_html/probation/foreign/index.php:85