ErrorException: Undefined index: back (ulogin)

[Rud]

Информация об ошибке

ErrorException: Undefined index: back - library/uLogin/ControllerPublic/Login.php:437
Сгенерирована пользователем: Вася, Вчера, в 22:41

Трассировка стэка

#0 /home/c/cb57390/forum.project-sourcetm.com/public_html/library/uLogin/ControllerPublic/Login.php(437): XenForo_Application::handlePhpError(8, 'Undefined index...', '/home/c/cb57390...', 437, Array)
#1 /home/c/cb57390/forum.project-sourcetm.com/public_html/library/uLogin/ControllerPublic/Login.php(249): uLogin_ControllerPublic_Login->_get_back_url()
#2 /home/c/cb57390/forum.project-sourcetm.com/public_html/library/uLogin/ControllerPublic/Login.php(48): uLogin_ControllerPublic_Login->uloginRegistrationUser(Array)
#3 /home/c/cb57390/forum.project-sourcetm.com/public_html/library/uLogin/ControllerPublic/Login.php(13): uLogin_ControllerPublic_Login->uloginParseRequest()
#4 /home/c/cb57390/forum.project-sourcetm.com/public_html/library/XenForo/FrontController.php(351): uLogin_ControllerPublic_Login->actionLogin()
#5 /home/c/cb57390/forum.project-sourcetm.com/public_html/library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#6 /home/c/cb57390/forum.project-sourcetm.com/public_html/index.php(13): XenForo_FrontController->run()
#7 {main}

Содержимое запроса

array(3) {
  ["url"] => string(135) "http://www.forum.project-sourcetm.com/ulogin/&back=aHR0cDovL3d3dy5mb3J1bS5wcm9qZWN0LXNvdXJjZXRtLmNvbS9hY2NvdW50L3BlcnNvbmFsLWRldGFpbHM="
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(1) {
    ["token"] => string(32) "fc6469a3911ce22d5ea6f57e6fedde61"
  }
}

Подскажите, а из-за чего так?

 

[Hope]

Вопрос в тему плагина задаём.