[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT ID FROM b_module ORDER BY ID
/var/www/ocompanii.net/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/var/www/ocompanii.net/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query(string)
	/var/www/ocompanii.net/bitrix/modules/main/lib/modulemanager.php:20
#2: Bitrix\Main\ModuleManager::getInstalledModules()
	/var/www/ocompanii.net/bitrix/modules/main/lib/loader.php:83
#3: Bitrix\Main\Loader::includeModule(string)
	/var/www/ocompanii.net/bitrix/modules/main/lib/data/connectionpool.php:308
#4: Bitrix\Main\Data\ConnectionPool->createSlaveConnection()
	/var/www/ocompanii.net/bitrix/modules/main/lib/data/connectionpool.php:247
#5: Bitrix\Main\Data\ConnectionPool->getSlaveConnection(string)
	/var/www/ocompanii.net/bitrix/modules/main/lib/db/connection.php:318
#6: Bitrix\Main\DB\Connection->query(string)
	/var/www/ocompanii.net/bitrix/modules/main/lib/modulemanager.php:20
#7: Bitrix\Main\ModuleManager::getInstalledModules()
	/var/www/ocompanii.net/bitrix/modules/main/lib/loader.php:83
#8: Bitrix\Main\Loader::includeModule(string)
	/var/www/ocompanii.net/bitrix/modules/main/classes/general/module.php:261
#9: CModule::IncludeModule(string)
	/var/www/ocompanii.net/bitrix/modules/main/classes/general/module.php:444
#10: ExecuteModuleEventEx(array)
	/var/www/ocompanii.net/bitrix/modules/main/include.php:196
#11: require_once(string)
	/var/www/ocompanii.net/bitrix/modules/main/include/prolog_before.php:14
#12: require_once(string)
	/var/www/ocompanii.net/bitrix/modules/main/include/prolog.php:10
#13: require_once(string)
	/var/www/ocompanii.net/bitrix/header.php:1
#14: require(string)
	/var/www/ocompanii.net/contacts/employers.php:2