按退出後的 Discuz! System Error

成功退出後再按退出(例如打开了两个窗口,在窗口一按了退出,然後成功退出後,在窗口二再按退出)就会出现以下页:

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Discuz! System Error
您当前的访问请求当中含有非法字符，已经被系统拒绝

PHP Debug

    [Line: 0026]member.php(discuz_application->init)
    [Line: 0071]source\class\discuz\discuz_application.php(discuz_application->_init_misc)
    [Line: 0552]source\class\discuz\discuz_application.php(discuz_application->_xss_check)
    [Line: 0355]source\class\discuz\discuz_application.php(system_error)
    [Line: 0023]source\function\function_core.php(discuz_error::system_error)
    [Line: 0024]source\class\discuz\discuz_error.php(discuz_error::debug_backtrace)

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3.0没有这个问题,但3.1和3.2就有这个问题呢