Fehlercode beim hochladen neuer Avatare

Fatal error: Dimensions for thumbnail can not exceed image dimensions.
Information:


id: a780c7a15d9b61224a30debba40bef4a9b97d46a
error message: Dimensions for thumbnail can not exceed image dimensions.
error code: 0
file: /var/www/clients/client3/web4/web/wcf/lib/system/image/adapter/ImageAdapter.class.php (77)
php version: 5.6.17-0+deb8u1
wcf version: 2.1.9 pl 1 (Typhoon)
date: Thu, 18 Feb 2016 14:01:43 +0000
request: /acp/index.php?select-user-avatar-add/&
referer: http://borderline-forum.org/acp/index.php?select-user-avatar-add/&
Stacktrace:


#0 /var/www/clients/client3/web4/web/wcf/lib/acp/form/SelectUserAvatarAddForm.class.php(190): wcf\system\image\adapter\ImageAdapter->createThumbnail(192, 192)
#1 /var/www/clients/client3/web4/web/wcf/lib/acp/form/SelectUserAvatarAddForm.class.php(145): wcf\acp\form\SelectUserAvatarAddForm->moveAvatar(Array)
#2 /var/www/clients/client3/web4/web/wcf/lib/form/AbstractForm.class.php(63): wcf\acp\form\SelectUserAvatarAddForm->save()
#3 /var/www/clients/client3/web4/web/wcf/lib/form/AbstractForm.class.php(114): wcf\form\AbstractForm->submit()
#4 /var/www/clients/client3/web4/web/wcf/lib/acp/form/SelectUserAvatarAddForm.class.php(92): wcf\form\AbstractForm->readData()
#5 /var/www/clients/client3/web4/web/wcf/lib/page/AbstractPage.class.php(273): wcf\acp\form\SelectUserAvatarAddForm->readData()
#6 /var/www/clients/client3/web4/web/wcf/lib/page/AbstractPage.class.php(100): wcf\page\AbstractPage->show()
#7 /var/www/clients/client3/web4/web/wcf/lib/system/request/Request.class.php(58): wcf\page\AbstractPage->__run()
#8 /var/www/clients/client3/web4/web/wcf/lib/system/request/RequestHandler.class.php(139): wcf\system\request\Request->execute()
#9 /var/www/clients/client3/web4/web/acp/index.php(10): wcf\system\request\RequestHandler->handle('wbb', true)
#10 {main}