Infinity loop in exception & error handler. 
Message:
PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in /var/www/html/dvs/vendor/windwalker/framework/src/Database/Driver/Pdo/PdoDriver.php:285
Stack trace:
#0 /var/www/html/dvs/vendor/windwalker/framework/src/Database/Driver/Pdo/PdoDriver.php(285): PDOStatement->execute()
#1 /var/www/html/dvs/vendor/windwalker/framework/src/Database/Driver/AbstractDatabaseDriver.php(246): Windwalker\Database\Driver\Pdo\PdoDriver->doExecute()
#2 /var/www/html/dvs/vendor/windwalker/framework/src/Database/Command/AbstractReader.php(295): Windwalker\Database\Driver\AbstractDatabaseDriver->execute()
#3 /var/www/html/dvs/vendor/windwalker/framework/src/Database/Driver/AbstractDatabaseDriver.php(764): Windwalker\Database\Command\AbstractReader->loadObjectList(NULL, '\\stdClass')
#4 /var/www/html/dvs/vendor/windwalker/framework/src/DataMapper/Adapter/WindwalkerAdapter.php(111): Windwalker\Database\Driver\AbstractDatabaseDriver->loadAll()
#5 /var/www/html/dvs/vendor/windwalker/framework/src/DataMapper/DataMapper.php(53): Windwalker\DataMapper\Adapter\WindwalkerAdapter->find('categories', '*', Array, Array, 0, 1)
#6 /var/www/html/dvs/vendor/windwalker/framework/src/DataMapper/AbstractDataMapper.php(195): Windwalker\DataMapper\DataMapper->doFind(Array, Array, 0, 1)
#7 /var/www/html/dvs/vendor/windwalker/framework/src/DataMapper/AbstractDataMapper.php(273): Windwalker\DataMapper\AbstractDataMapper->find(Array, Array, 0, 1)
#8 [internal function]: Windwalker\DataMapper\AbstractDataMapper->findOne(1)
#9 /var/www/html/dvs/vendor/windwalker/core/src/Core/DataMapper/AbstractDataMapperProxy.php(73): call_user_func_array(Array, Array)
#10 /var/www/html/dvs/vendor/lyrasoft/luna/src/Category/CategoryHelper.php(88): Windwalker\Core\DataMapper\AbstractDataMapperProxy->__call('findOne', Array)
#11 /var/www/html/dvs/vendor/lyrasoft/luna/src/Category/CategoryHelper.php(149): Lyrasoft\Luna\Category\CategoryHelper::getCategories('product', 1, 1, Array, 'lft', NULL, NULL)
#12 /var/www/html/dvs/src/Catalog/Listener/ViewListener.php(36): Lyrasoft\Luna\Category\CategoryHelper::getAvailableCategories('product', 1, 1)
#13 [internal function]: Catalog\Listener\ViewListener->onViewBeforeRender(Object(Windwalker\Event\Event))
#14 /var/www/html/dvs/vendor/windwalker/core/src/Core/Event/EventDispatcher.php(90): call_user_func(Array, Object(Windwalker\Event\Event))
#15 /var/www/html/dvs/vendor/windwalker/core/src/Core/View/AbstractView.php(152): Windwalker\Core\Event\EventDispatcher->triggerEvent(Object(Windwalker\Event\Event), Array)
#16 /var/www/html/dvs/vendor/windwalker/core/src/Core/View/PhpHtmlView.php(66): Windwalker\Core\View\AbstractView->render()
#17 /var/www/html/dvs/src/Catalog/Error/CatalogErrorHandler.php(81): Windwalker\Core\View\PhpHtmlView->render()
#18 /var/www/html/dvs/vendor/windwalker/core/src/Core/Error/ErrorHandler.php(94): Catalog\Error\CatalogErrorHandler::respond(Object(PDOException))
#19 [internal function]: Windwalker\Core\Error\ErrorHandler::exception(Object(PDOException))
#20 {main}

Next PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away
SQL: SELECT *
FROM categories
WHERE `id` = '1' LIMIT 0, 1 in /var/www/html/dvs/vendor/windwalker/framework/src/Database/Driver/Pdo/PdoDriver.php:289
Stack trace:
#0 /var/www/html/dvs/vendor/windwalker/framework/src/Database/Driver/AbstractDatabaseDriver.php(246): Windwalker\Database\Driver\Pdo\PdoDriver->doExecute()
#1 /var/www/html/dvs/vendor/windwalker/framework/src/Database/Command/AbstractReader.php(295): Windwalker\Database\Driver\AbstractDatabaseDriver->execute()
#2 /var/www/html/dvs/vendor/windwalker/framework/src/Database/Driver/AbstractDatabaseDriver.php(764): Windwalker\Database\Command\AbstractReader->loadObjectList(NULL, '\\stdClass')
#3 /var/www/html/dvs/vendor/windwalker/framework/src/DataMapper/Adapter/WindwalkerAdapter.php(111): Windwalker\Database\Driver\AbstractDatabaseDriver->loadAll()
#4 /var/www/html/dvs/vendor/windwalker/framework/src/DataMapper/DataMapper.php(53): Windwalker\DataMapper\Adapter\WindwalkerAdapter->find('categories', '*', Array, Array, 0, 1)
#5 /var/www/html/dvs/vendor/windwalker/framework/src/DataMapper/AbstractDataMapper.php(195): Windwalker\DataMapper\DataMapper->doFind(Array, Array, 0, 1)
#6 /var/www/html/dvs/vendor/windwalker/framework/src/DataMapper/AbstractDataMapper.php(273): Windwalker\DataMapper\AbstractDataMapper->find(Array, Array, 0, 1)
#7 [internal function]: Windwalker\DataMapper\AbstractDataMapper->findOne(1)
#8 /var/www/html/dvs/vendor/windwalker/core/src/Core/DataMapper/AbstractDataMapperProxy.php(73): call_user_func_array(Array, Array)
#9 /var/www/html/dvs/vendor/lyrasoft/luna/src/Category/CategoryHelper.php(88): Windwalker\Core\DataMapper\AbstractDataMapperProxy->__call('findOne', Array)
#10 /var/www/html/dvs/vendor/lyrasoft/luna/src/Category/CategoryHelper.php(149): Lyrasoft\Luna\Category\CategoryHelper::getCategories('product', 1, 1, Array, 'lft', NULL, NULL)
#11 /var/www/html/dvs/src/Catalog/Listener/ViewListener.php(36): Lyrasoft\Luna\Category\CategoryHelper::getAvailableCategories('product', 1, 1)
#12 [internal function]: Catalog\Listener\ViewListener->onViewBeforeRender(Object(Windwalker\Event\Event))
#13 /var/www/html/dvs/vendor/windwalker/core/src/Core/Event/EventDispatcher.php(90): call_user_func(Array, Object(Windwalker\Event\Event))
#14 /var/www/html/dvs/vendor/windwalker/core/src/Core/View/AbstractView.php(152): Windwalker\Core\Event\EventDispatcher->triggerEvent(Object(Windwalker\Event\Event), Array)
#15 /var/www/html/dvs/vendor/windwalker/core/src/Core/View/PhpHtmlView.php(66): Windwalker\Core\View\AbstractView->render()
#16 /var/www/html/dvs/src/Catalog/Error/CatalogErrorHandler.php(81): Windwalker\Core\View\PhpHtmlView->render()
#17 /var/www/html/dvs/vendor/windwalker/core/src/Core/Error/ErrorHandler.php(94): Catalog\Error\CatalogErrorHandler::respond(Object(PDOException))
#18 [internal function]: Windwalker\Core\Error\ErrorHandler::exception(Object(PDOException))
#19 {main}