[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT ID FROM b_module ORDER BY ID
/home/anderssen/web/anderssen.ru/public_html/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/home/anderssen/web/anderssen.ru/public_html/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query(string)
	/home/anderssen/web/anderssen.ru/public_html/bitrix/modules/main/lib/modulemanager.php:20
#2: Bitrix\Main\ModuleManager::getInstalledModules()
	/home/anderssen/web/anderssen.ru/public_html/bitrix/modules/main/lib/loader.php:91
#3: Bitrix\Main\Loader::includeModule(string)
	/home/anderssen/web/anderssen.ru/public_html/bitrix/modules/main/classes/general/module.php:261
#4: CModule::IncludeModule(string)
	/home/anderssen/web/anderssen.ru/public_html/bitrix/modules/main/classes/general/module.php:444
#5: ExecuteModuleEventEx(array)
	/home/anderssen/web/anderssen.ru/public_html/bitrix/modules/main/include.php:291
#6: require_once(string)
	/home/anderssen/web/anderssen.ru/public_html/bitrix/modules/main/include/prolog_before.php:14
#7: require(string)
	/home/anderssen/web/anderssen.ru/public_html/ajax/form.php:1