Editing a user rank with missing image file leads to an exception

[BurntimeX]

Error Type: InvalidArgumentException

Error Message: File '....png' could not be found.

File: */lib/system/file/upload/UploadFile.class.php (91)

Stack Trace: #0 */lib/data/user/rank/UserRank.class.php (84): wcf\system\file\upload\UploadFile->__construct() #1 */lib/acp/form/UserRankEditForm.class.php (119): wcf\data\user\rank\UserRank->getImageFile() #2 */lib/page/AbstractPage.class.php (339): wcf\acp\form\UserRankEditForm->readData() #3 */lib/page/AbstractPage.class.php (122): wcf\page\AbstractPage->show() #4 */lib/system/request/Request.class.php (89): wcf\page\AbstractPage->__run() #5 */lib/system/request/RequestHandler.class.php (121): wcf\system\request\Request->execute() #6 */acp/index.php (11): wcf\system\request\RequestHandler->handle()