Stack trace
#0 [internal function]: XF::handlePhpError(8192, '[E_DEPRECATED] ...', '/Users/zix/Docu...', 141)
#1 src/vendor/dokuwiki/utf8/utf8.php(141): utf8_decode(NULL)
#2 src/addons/ZixVN/Exams/Service/Question/Preparer.php(236): utf8_strlen(NULL)
#3 src/addons/ZixVN/Exams/Service/Question/Preparer.php(214): ZixVN\Exams\Service\Question\Preparer->performSave()
#4 src/addons/ZixVN/Exams/Service/Question/Editor.php(83): ZixVN\Exams\Service\Question\Preparer->afterUpdate()
#5 src/XF/Service/ValidateAndSavableTrait.php(42): ZixVN\Exams\Service\Question\Editor->_save()
#6 src/addons/ZixVN/Exams/ControllerPlugin/Question.php(126): ZixVN\Exams\Service\Question\Editor->save()
#7 src/addons/LilTee/ExtendExams/ZixVN/Exams/ControllerPlugin/Question.php(20): ZixVN\Exams\ControllerPlugin\Question->saveQuestionProcess(Object(ZixVN\Exams\Service\Question\Editor))
#8 src/addons/ZixVN/Exams/Pub/Controller/Question.php(130): LilTee\ExtendExams\ZixVN\Exams\ControllerPlugin\Question->saveQuestionProcess(Object(ZixVN\Exams\Service\Question\Editor))
#9 src/addons/LilTee/ExtendExams/ZixVN/Exams/Pub/Controller/Question.php(417): ZixVN\Exams\Pub\Controller\Question->actionEdit(Object(XF\Mvc\ParameterBag))
#10 src/XF/Mvc/Dispatcher.php(352): LilTee\ExtendExams\ZixVN\Exams\Pub\Controller\Question->actionEdit(Object(XF\Mvc\ParameterBag))
#11 src/XF/Mvc/Dispatcher.php(259): XF\Mvc\Dispatcher->dispatchClass('ZixVN\\Exams:Que...', 'Edit', Object(XF\Mvc\RouteMatch), Object(LilTee\MediaRelationships\ZixVN\Exams\Pub\Controller\Question), NULL)
#12 src/XF/Mvc/Dispatcher.php(115): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(LilTee\MediaRelationships\ZixVN\Exams\Pub\Controller\Question), NULL)
#13 src/XF/Mvc/Dispatcher.php(57): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#14 src/XF/App.php(2351): XF\Mvc\Dispatcher->run()
#15 src/XF.php(517): XF\App->run()
#16 index.php(20): XF::runApp('XF\\Pub\\App')
#17 {main}