Notice: Trying to get property 'documentElement' of non-object in /var/www/html/application/libraries/Zend/Feed/Writer/Renderer/Entry/Atom.php on line 398

Fatal error: Uncaught TypeError: Argument 1 passed to DOMDocument::importNode() must be an instance of DOMNode, null given in /var/www/html/application/libraries/Zend/Feed/Writer/Renderer/Entry/Atom.php:366 Stack trace: #0 /var/www/html/application/libraries/Zend/Feed/Writer/Renderer/Entry/Atom.php(366): DOMDocument->importNode() #1 /var/www/html/application/libraries/Zend/Feed/Writer/Renderer/Entry/Atom.php(74): Zend_Feed_Writer_Renderer_Entry_Atom->_setContent() #2 /var/www/html/application/libraries/Zend/Feed/Writer/Renderer/Feed/Atom.php(123): Zend_Feed_Writer_Renderer_Entry_Atom->render() #3 /var/www/html/application/libraries/Zend/Feed/Writer/Feed.php(279): Zend_Feed_Writer_Renderer_Feed_Atom->render() #4 /var/www/html/plugins/SuperRss/views/shared/items/browse.srss.php(67): Zend_Feed_Writer_Feed->export() #5 /var/www/html/application/libraries/Omeka/View.php(114): include('/var/www/html/p...') #6 /var/www/html/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run() #7 /var/www/html/application/librari in /var/www/html/application/libraries/Zend/Feed/Writer/Renderer/Entry/Atom.php on line 366