« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« Execution of a query to the database failed - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 »
      SQL: SELECT pagetitle FROM modx_site_content WHERE id=
      [Copy SQL to ClipBoard]
Parser timing
  MySQL: 0.0026 s(9 Requests)
  PHP: 0.0429 s 
  Total: 0.0455 s