Omeka has encountered an error

InvalidArgumentException

Invalid record passed to recordMetadata.

exception 'InvalidArgumentException' with message 'Invalid record passed to recordMetadata.' in /var/www/html/omeka/application/views/helpers/Metadata.php:58
Stack trace:
#0 [internal function]: Omeka_View_Helper_Metadata->metadata(NULL, Array, Array)
#1 /var/www/html/omeka/application/libraries/Zend/View/Abstract.php(350): call_user_func_array(Array, Array)
#2 /var/www/html/omeka/application/libraries/globals.php(2038): Zend_View_Abstract->__call('metadata', Array)
#3 /var/www/html/omeka/application/libraries/globals.php(2038): Omeka_View->metadata(NULL, Array, Array)
#4 /var/www/html/omeka/plugins/MlaCitations/MlaCitationsPlugin.php(90): metadata(NULL, Array)
#5 [internal function]: MlaCitationsPlugin->filterItemCitation('“Parker P...', Array)
#6 /var/www/html/omeka/application/libraries/Omeka/Plugin/Broker.php(271): call_user_func(Array, '“Parker P...', Array)
#7 /var/www/html/omeka/application/libraries/globals.php(324): Omeka_Plugin_Broker->applyFilters('item_citation', '“Parker P...', Array)
#8 /var/www/html/omeka/application/models/Item.php(496): apply_filters('item_citation', '“Parker P...', Array)
#9 /var/www/html/omeka/application/models/Item.php(203): Item->getCitation()
#10 /var/www/html/omeka/application/views/helpers/Metadata.php(169): Item->getProperty('citation')
#11 /var/www/html/omeka/application/views/helpers/Metadata.php(144): Omeka_View_Helper_Metadata->_getRecordMetadata(Object(Item), 'citation')
#12 /var/www/html/omeka/application/views/helpers/Metadata.php(73): Omeka_View_Helper_Metadata->_getText(Object(Item), 'citation')
#13 [internal function]: Omeka_View_Helper_Metadata->metadata('item', 'citation', Array)
#14 /var/www/html/omeka/application/libraries/Zend/View/Abstract.php(350): call_user_func_array(Array, Array)
#15 /var/www/html/omeka/application/libraries/globals.php(2038): Zend_View_Abstract->__call('metadata', Array)
#16 /var/www/html/omeka/application/libraries/globals.php(2038): Omeka_View->metadata('item', 'citation', Array)
#17 /var/www/html/omeka/themes/neatscape/items/show.php(37): metadata('item', 'citation', Array)
#18 /var/www/html/omeka/application/libraries/Omeka/View.php(117): include('/var/www/html/o...')
#19 /var/www/html/omeka/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/var/www/html/o...')
#20 /var/www/html/omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(912): Zend_View_Abstract->render('items/show.php')
#21 /var/www/html/omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(933): Zend_Controller_Action_Helper_ViewRenderer->renderScript('items/show.php', NULL)
#22 /var/www/html/omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(972): Zend_Controller_Action_Helper_ViewRenderer->render()
#23 /var/www/html/omeka/application/libraries/Zend/Controller/Action/HelperBroker.php(277): Zend_Controller_Action_Helper_ViewRenderer->postDispatch()
#24 /var/www/html/omeka/application/libraries/Zend/Controller/Action.php(527): Zend_Controller_Action_HelperBroker->notifyPostDispatch()
#25 /var/www/html/omeka/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('showAction')
#26 /var/www/html/omeka/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#27 /var/www/html/omeka/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#28 /var/www/html/omeka/application/libraries/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#29 /var/www/html/omeka/application/libraries/Omeka/Application.php(77): Zend_Application->run()
#30 /var/www/html/omeka/index.php(23): Omeka_Application->run()
#31 {main}