[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: MySQL server has gone away (400)
INSERT INTO b_cache_tag (SITE_ID, CACHE_SALT, RELATIVE_PATH, TAG) VALUES ('*', '*', '/bitrix/managed_cache/MYSQL/b_undo.~174099', '*')
/home/lekso/www/public/bitrix/modules/main/lib/db/mysqlconnection.php:118
#0: Bitrix\Main\DB\MysqlConnection->queryInternal(string, array, NULL)
	/home/lekso/www/public/bitrix/modules/main/lib/db/connection.php:332
#1: Bitrix\Main\DB\Connection->query(string, NULL)
	/home/lekso/www/public/bitrix/modules/main/lib/db/connection.php:381
#2: Bitrix\Main\DB\Connection->queryExecute(string)
	/home/lekso/www/public/bitrix/modules/main/lib/data/cacheenginefiles.php:190
#3: Bitrix\Main\Data\CacheEngineFiles->clean(string, string)
	/home/lekso/www/public/bitrix/modules/main/lib/data/cache.php:244
#4: Bitrix\Main\Data\Cache->cleanDir(string, string)
	/home/lekso/www/public/bitrix/modules/main/lib/data/managedcache.php:133
#5: Bitrix\Main\Data\ManagedCache->cleanDir(string)
	/home/lekso/www/public/bitrix/modules/main/classes/general/cache.php:426
#6: CCacheManager->CleanDir(string)
	/home/lekso/www/public/bitrix/modules/main/classes/general/undo.php:179
#7: CUndo::CleanUpOld()
	/home/lekso/www/public/bitrix/modules/main/classes/mysql/agent.php(159) : eval()'d code:1
#8: eval()
	/home/lekso/www/public/bitrix/modules/main/classes/mysql/agent.php:159
#9: CAgent::ExecuteAgents(string)
	/home/lekso/www/public/bitrix/modules/main/classes/mysql/agent.php:38
#10: CAgent::CheckAgents()
	/home/lekso/www/public/bitrix/modules/main/include.php:1
#11: require_once(string)
	/home/lekso/www/public/bitrix/modules/main/include/prolog_before.php:14
#12: require_once(string)
	/home/lekso/www/public/bitrix/modules/main/include/prolog.php:11
#13: require_once(string)
	/home/lekso/www/public/bitrix/header.php:1
#14: include(string)
	/home/lekso/www/public/catalog/index.php:62
#15: include_once(string)
	/home/lekso/www/public/bitrix/modules/main/include/urlrewrite.php:154
#16: include_once(string)
	/home/lekso/www/public/bitrix/urlrewrite.php:6