Issue: Undefined index: attachfileid

ErrorException: Undefined index: attachfileid - vault/core/controller/asset/vw.php:817 
Generated By: Chris james, Today at 7:52 AM

Stack Trace
#0 /vault/core/controller/asset/vw.php(817): XenForo_Application::handlePhpError(8, 'Undefined index...', '/home/...', 817, Array)
#1 /vault/core/controller/asset/vw.php(131): vw_Asset_Controller->create_thumbnail(Array)
#2 /library/vw/XenForo/ControllerPublic/Wiki/Asset.php(42): vw_Asset_Controller->resolve()
#3 /library/XenForo/FrontController.php(351): vw_XenForo_ControllerPublic_Wiki_Asset->actionIndex()
#4 /library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#5 /index.php(13): XenForo_FrontController->run()
#6 {main}
Request State
array(3) {
  ["url"] => string(56) "https://forum.com/wiki-asset/?pid=1235&x=100&dpr=2"
  ["_GET"] => array(3) {
    ["pid"] => string(4) "1235"
    ["x"] => string(3) "100"
    ["dpr"] => string(1) "2"
  }
  ["_POST"] => array(0) {
  }
}