Database Query Error - You've Probably Found a Bug

Database query failed

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Query select sql_calc_found_rows biblio.* ,biblio_copy.copyid ,biblio_copy.barcode_nmbr ,biblio_copy.status_cd ,biblio_copy.due_back_dt ,biblio_copy.mbrid from biblio left join biblio_copy on biblio.bibid=biblio_copy.bibid order by `` limit 0, 12 failed. The DBMS said this:

Unknown column '' in 'order clause'

Debug Backtrace (most recent call first):

/data/web/virtuals/90623/virtual/www/domains/logoknihovna/classes/Error.php:137 FatalHandler->printBackTrace()
/data/web/virtuals/90623/virtual/www/domains/logoknihovna/classes/Error.php:105 FatalHandler->dbError('select sql_calc_found_rows biblio.* ,biblio_copy.copyid ,biblio_copy.barcode_nmbr ,biblio_copy.status_cd ,biblio_copy.due_back_dt ,biblio_copy.mbrid from biblio left join biblio_copy on biblio.bibid=biblio_copy.bibid  order by ``  limit 0, 12', 'Database query failed', 'Unknown column \'\' in \'order clause\'')
/data/web/virtuals/90623/virtual/www/domains/logoknihovna/classes/Query.php:91 Fatal->dbError('select sql_calc_found_rows biblio.* ,biblio_copy.copyid ,biblio_copy.barcode_nmbr ,biblio_copy.status_cd ,biblio_copy.due_back_dt ,biblio_copy.mbrid from biblio left join biblio_copy on biblio.bibid=biblio_copy.bibid  order by ``  limit 0, 12', 'Database query failed', 'Unknown column \'\' in \'order clause\'')
/data/web/virtuals/90623/virtual/www/domains/logoknihovna/classes/Query.php:286 Query->_act('select sql_calc_found_rows biblio.* ,biblio_copy.copyid ,biblio_copy.barcode_nmbr ,biblio_copy.status_cd ,biblio_copy.due_back_dt ,biblio_copy.mbrid from biblio left join biblio_copy on biblio.bibid=biblio_copy.bibid  order by ``  limit 0, 12')
/data/web/virtuals/90623/virtual/www/domains/logoknihovna/classes/BiblioSearchQuery.php:200 Query->_query('select sql_calc_found_rows biblio.* ,biblio_copy.copyid ,biblio_copy.barcode_nmbr ,biblio_copy.status_cd ,biblio_copy.due_back_dt ,biblio_copy.mbrid from biblio left join biblio_copy on biblio.bibid=biblio_copy.bibid  order by ``  limit 0, 12', 'Chyba při hledání.')
/data/web/virtuals/90623/virtual/www/domains/logoknihovna/shared/biblio_search.php:131 BiblioSearchQuery->search('2', array (
  0 => '',
), 1, NULL, false)