InvalidArgumentException: Failed to convert to JSON. Error: Malformed UTF-8 characters, possibly incorrectly encoded [match_params] in src/XF/Import/Data/EntityEmulator.php at line 155
 
XF\Import\Data\EntityEmulator->set() in src/XF/Import/Data/AbstractEmulatedData.php at line 35
XF\Import\Data\AbstractEmulatedData->set() in src/XF/Import/Data/AbstractData.php at line 98
XF\Import\Data\AbstractData->bulkSet() in src/addons/XFI/Import/Importer/vBulletin.php at line 858
XFI\Import\Importer\vBulletin->stepUserFields() in src/XF/Import/Runner.php at line 231
XF\Import\Runner->runStep() in src/XF/Import/Runner.php at line 59
XF\Import\Runner->run() in src/XF/Admin/Controller/Import.php at line 234
XF\Admin\Controller\Import->actionRun() in src/XF/Mvc/Dispatcher.php at line 350
XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 261
XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 113
XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 55
XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2184
XF\App->run() in src/XF.php at line 391
XF::runApp() in admin.php at line 13