Issue: Undefined variable: parentfield

ErrorException: Undefined variable: parentfield - vault/core/controller/dm/area/vw.php:82

#0 /../vault/core/controller/dm/area/vw.php(82): XenForo_Application::handlePhpError(8, 'Undefined varia...', '/homepages/34/d...', 82, Array)
#1 /../vault/core/controller/dm/area/xf.php(33): vw_DM_Area_Controller->verify_parentid(0)
#2 [internal function]: vw_DM_Area_Controller_XF->verify_parentid(0, Object(vw_DM_Area_Controller_XF), 'parentid', Array)
#3 /../library/XenForo/DataWriter.php(982): call_user_func_array(Array, Array)
#4 /../library/XenForo/DataWriter.php(725): XenForo_DataWriter->_runVerificationCallback(Array, 0, Array, 'parentid')
#5 /../library/XenForo/DataWriter.php(643): XenForo_DataWriter->_isFieldValueValid('parentid', Array, 0, Array)
#6 /../vault/core/controller/dm/xf.php(230): XenForo_DataWriter->set('parentid', 0, NULL)
#7 /../vault/core/controller/cp/area/vw.php(395): vw_DM_Controller_XF->set('parentid', 0)
#8 /../vault/core/controller/cp/area/vw.php(158): vw_CP_Area_Controller->set_area_fields(Array)
#9 /../vault/core/controller/cp/area/vw.php(146): vw_CP_Area_Controller->process_save(Array)
#10 /../vault/core/controller/cp/area/vw.php(68): vw_CP_Area_Controller->save()
#11 /../library/vw/XenForo/ControllerAdmin/Wiki.php(107): vw_CP_Area_Controller->execute('save', 'post')
#12 /../library/XenForo/FrontController.php(347): vw_XenForo_ControllerAdmin_Wiki->actionIndex()
#13 /../library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#14 /../admin.php(13): XenForo_FrontController->run()
#15 {main}

array(3) {
  ["url"] => string(67) "http://domain.com/admin.php?wiki/&panel=area&do=save"
  ["_GET"] => array(3) {
    ["wiki/"] => string(0) ""
    ["panel"] => string(4) "area"
    ["do"] => string(4) "save"
  }
  ["_POST"] => array(17) {
    ["panel"] => string(4) "area"
    ["do"] => string(4) "save"
    ["_xfToken"] => string(8) "********"
    ["areaid"] => string(1) "2"
    ["title"] => string(6) "System"
    ["parentid"] => string(1) "0"
    ["displayorder"] => string(1) "0"
    ["autoprotect"] => string(1) "0"
    ["prefixlist"] => array(1) {
      [-1] => string(12) "[Any Prefix]"
    }
    ["allowtypes"] => array(1) {
      [0] => string(8) "Any Type"
    }
    ["langlist"] => array(1) {
      [2] => string(12) "Deutsch [Du]"
    }
    ["options"] => array(8) {
      ["page_comment"] => string(1) "1"
      ["page_img"] => string(1) "2"
      ["page_bbcode"] => string(1) "4"
      ["page_smile"] => string(1) "8"
      ["comment_img"] => string(2) "32"
      ["comment_bbcode"] => string(2) "64"
      ["comment_smile"] => string(3) "128"
      ["page_header"] => string(1) "1"
    }
    ["topiclist"] => array(1) {
      [-1] => string(9) "Any Topic"
    }
    ["sort"] => string(10) "lastupdate"
    ["sortorder"] => string(3) "asc"
    ["submit"] => string(4) "Save"
    ["url"] => string(59) "http://domain.com/admin.php?wiki/&panel=area"
  }
}