Fatal error: Uncaught Error: Call to a member function getTagName() on null in /home/public/includes/classes/org/active-link/xml/XML.php:504 Stack trace: #0 /home/public/includes/modsxml.inc.php(274): XML->setTagAttribute('version', '3.2') #1 /home/public/includes/modsxml.inc.php(203): modsRecord(Array) #2 /home/public/export/export_modsxml.php(31): modsCollection(Object(mysqli_result)) #3 /home/public/search.php(1758): exportRecords(Object(mysqli_result), '', '5', '', 'Export') #4 /home/public/search.php(586): generateExport(Object(mysqli_result), '', '5', 'MODS XML', 'file', '', 'Export', '', 0) #5 {main} thrown in /home/public/includes/classes/org/active-link/xml/XML.php on line 504