Internal Server Error

MartiniError: DOMDocument::saveHTML(): output conversion failed due to conv error, bytes 0xA3 0x31 0x32 0x20

    in /var/www/html/martini-git/src/core/document/DocumentDisplay.php at line 4083

#0 [internal function]: ErrorHandler::handleError(2, 'DOMDocument::sa...', '/var/www/html/m...', 4083, Array)
#1 /var/www/html/martini-git/src/core/document/DocumentDisplay.php(4083): DOMDocument->saveHTML()
#2 /var/www/html/martini-git/src/core/document/DocumentDisplay.php(3974): DocumentDisplay->getDomBodyNodeHtml()
#3 /var/www/html/martini-git/src/core/document/DocumentDisplay.php(494): DocumentDisplay->getCleansedHtmlFromDom(NULL, true)
#4 /var/www/html/martini-git/src/modules/BlockArticleModule.php(407): DocumentDisplay->render()
#5 /var/www/html/martini-git/src/core/ModuleController.php(229): BlockArticleModule->generateDisplay(Object(HttpRequest), Array)
#6 /var/www/html/martini-git/src/core/ModuleController.php(150): ModuleController->callAction('generateDisplay', Object(HttpRequest), Array)
#7 /var/www/html/martini-git/src/core/ModuleController.php(58): ModuleController->handleRequest(Object(HttpRequest))
#8 /var/www/html/martini-git/src/web.php(568): ModuleController->handleDisplayRequest(Object(HttpRequest))
#9 /var/www/html/martini-git/src/web.php(107): RequestHandler->handleRequestInternal(Object(HttpRequest))
#10 /var/www/html/martini-git/lib/http.php(77): RequestHandler->handleRequest(Object(HttpRequest))
#11 /var/www/html/martini-git/htdocs/index.php(155): HttpApplication->run()
#12 {main}