Issue: ErrorException: Undefined index: prefixid

Server Error Log
Error Info
ErrorException: Undefined index: prefixid - vault/core/view/ui/assign/vw.php:476
Generated By: hollosch, 9 minutes ago
Stack Trace
#0 ../vault/core/view/ui/assign/vw.php(476): XenForo_Application::handlePhpError(8, 'Undefined index...', '/var/www/vhosts...', 476, Array)
#1 ../vault/core/controller/ui/ajax/search/vw.php(71): vw_UI_Assign_View->get_results(Array)
#2 ../library/vw/XenForo/ControllerPublic/Wiki/Ajax.php(48): vw_UI_AJAX_Search_Controller->execute()
#3 ../library/XenForo/FrontController.php(351): vw_XenForo_ControllerPublic_Wiki_Ajax->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(54) "http://regio-portal.wiki/index.php?wiki-ajax/&c=search"
  ["_GET"] => array(2) {
    ["wiki-ajax/"] => string(0) ""
    ["c"] => string(6) "search"
  }
  ["_POST"] => array(5) {
    ["ajax"] => int(1)
    ["query"] => string(1) "M"
    ["typechoice"] => array(7) {
      [0] => string(1) "1"
      [1] => string(1) "3"
      [2] => string(2) "11"
      [3] => string(2) "12"
      [4] => string(2) "13"
      [5] => string(2) "14"
      [6] => string(2) "15"
    }
    ["_xfToken"] => string(8) "********"
    ["c"] => string(6) "search"
  }
}