« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« Execution of a query to the database failed - Unknown column '1a' in 'where clause' »
      SQL: SELECT DISTINCT sc.* FROM `c20isatsql`.modx_site_content sc LEFT JOIN `c20isatsql`.modx_document_groups dg on dg.document = sc.id WHERE (sc.id IN (1a) AND sc.published=1 AND sc.deleted=0 ) AND (sc.privateweb=0) LIMIT 1
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Parser timing
  MySQL: 0.0003 s s(0 Requests)
  PHP: 0.0021 s s 
  Total: 0.0024 s s