« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« Execution of a query to the database failed - Lost connection to MySQL server during query »
      SQL: SELECT name FROM `modx`.`modx_site_tmplvars`
      [Copy SQL to ClipBoard]
 
Parser timing
  MySQL: 0.0156 s(0 Requests)
  PHP: 1.5642 s 
  Total: 1.5799 s 
Error while inserting event log into database.