500 Internal Server Error

MartiniError: Trying to get property of non-object

    in /var/www/html/martini-git/src/core/document/DocumentDisplay.php at line 1359

#0 /var/www/html/martini-git/src/core/document/DocumentDisplay.php(1359): ErrorHandler::handleError(8, 'Trying to get p...', '/var/www/html/m...', 1359, Array)
#1 /var/www/html/martini-git/src/core/document/DocumentDisplay.php(416): DocumentDisplay->populateTaxonomyData()
#2 /var/www/html/martini-git/src/modules/BlockArticleModule.php(395): DocumentDisplay->render()
#3 /var/www/html/martini-git/src/core/ModuleController.php(229): BlockArticleModule->generateDisplay(Object(HttpRequest), Array)
#4 /var/www/html/martini-git/src/core/ModuleController.php(150): ModuleController->callAction('generateDisplay', Object(HttpRequest), Array)
#5 /var/www/html/martini-git/src/core/ModuleController.php(58): ModuleController->handleRequest(Object(HttpRequest))
#6 /var/www/html/martini-git/src/web.php(569): ModuleController->handleDisplayRequest(Object(HttpRequest))
#7 /var/www/html/martini-git/src/web.php(106): RequestHandler->handleRequestInternal(Object(HttpRequest))
#8 /var/www/html/martini-git/lib/http.php(77): RequestHandler->handleRequest(Object(HttpRequest))
#9 /var/www/html/martini-git/htdocs/index.php(139): HttpApplication->run()
#10 {main}