[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
INSERT INTO b_cache_tag (SITE_ID, CACHE_SALT, RELATIVE_PATH, TAG) VALUES ('*', '*', '/bitrix/cache/s1/bitrix/news.detail.~521161', '*')
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query(string, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:379
#2: Bitrix\Main\DB\Connection->queryExecute(string)
	/home/bitrix/www/bitrix/modules/main/lib/data/cacheenginefiles.php:218
#3: Bitrix\Main\Data\CacheEngineFiles->clean(string, string)
	/home/bitrix/www/bitrix/modules/main/lib/data/cache.php:256
#4: Bitrix\Main\Data\Cache->cleanDir(string, string)
	/home/bitrix/www/bitrix/modules/main/classes/general/cache.php:45
#5: CPHPCache->CleanDir(string, string)
	/home/bitrix/www/bitrix/modules/main/classes/general/cache.php:310
#6: BXClearCache(boolean, string)
	/home/bitrix/www/bitrix/php_interface/init.php:94
#7: setCity(integer)
	/home/bitrix/www/bitrix/php_interface/init.php:85
#8: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include.php:234
#9: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#10: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#11: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#12: require(string)
	/home/bitrix/www/catalog/index.php:2
#13: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#14: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2