DB query error.
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Fatal error: Uncaught Bitrix\Main\DB\SqlQueryException: Mysql query error: (2006) MySQL server has gone away in /var/www/egrn/data/www/xn--80aafcj7asqhcj.xn--p1ai/bitrix/modules/main/lib/db/mysqliconnection.php:137 Stack trace: #0 /var/www/egrn/data/www/xn--80aafcj7asqhcj.xn--p1ai/bitrix/modules/main/lib/db/mysqlcommonconnection.php(132): Bitrix\Main\DB\MysqliConnection->queryInternal('SELECT * FROM `...') #1 /var/www/egrn/data/www/xn--80aafcj7asqhcj.xn--p1ai/bitrix/modules/main/lib/db/connection.php(716): Bitrix\Main\DB\MysqlCommonConnection->getTableFields('b_sec_session') #2 /var/www/egrn/data/www/xn--80aafcj7asqhcj.xn--p1ai/bitrix/modules/main/lib/db/sqlhelper.php(387): Bitrix\Main\DB\Connection->getTableField('b_sec_session', 'SESSION_ID') #3 /var/www/egrn/data/www/xn--80aafcj7asqhcj.xn--p1ai/bitrix/modules/main/lib/entity/datamanager.php(974): Bitrix\Main\DB\SqlHelper->prepareAssignment('b_sec_session', 'SESSION_ID', 'z1Oez92mmyH9DNc...') #4 /var/www/egrn/data/www/xn--80aafcj7asqhcj.xn--p1ai/bitrix/modules/security/ in /var/www/egrn/data/www/xn--80aafcj7asqhcj.xn--p1ai/bitrix/modules/main/lib/db/mysqliconnection.php on line 137