ERROR: MySQL server has gone away:

SELECT database() AS `name`

11. [ERROR] rude\exception::error()         called at /var/www/medsites/shared/includes/rude-php/src/database/rude-database.php:94
10. [OK]    rude\database->query()          called at /var/www/medsites/linkxpress/includes/Helper/Rude.php:117
 9. [OK]    Helper_Rude::database_name()    called at /var/www/medsites/linkxpress/includes/Helper/Rude.php:82
 8. [OK]    Helper_Rude::connect_medsites() called at /var/www/medsites/shared/includes/rude-php/src/workspace/etc/rude-rude.php:9
 7. [OK]    rude\rude::connect_medsites()   called at /var/www/medsites/linkxpress/includes/Helper/Visitor.php:127
 6. [OK]    Helper_Visitor::is_bot()        called at /var/www/medsites/shared/modules/mod_bannersmanager.php:382
 5. [OK]    include()                       called at /var/www/medsites/shared/includes/frontend.html.php:338
 4. [OK]    modules_html::modoutput_naked() called at /var/www/medsites/shared/includes/frontend.html.php:117
 3. [OK]    modules_html::module2()         called at /var/www/medsites/shared/includes/frontend.php:186
 2. [OK]    mosLoadModules()                called at /var/www/medsites/hospimedica/templates/rhuk_solarflare_ii/index.php:170
 1. [OK]    require_once()                  called at /var/www/medsites/hospimedica/index.php:406