Issue: ErrorException: Undefined offset: 1

Error Info
ErrorException: Undefined offset: 1 - vault/core/controller/cp/index/vw.php:99 
Generated By: alfa, 36 minutes ago
Stack Trace
#0 /vault/core/controller/cp/index/vw.php(99): XenForo_Application::handlePhpError(8, 'Undefined offse...', '/home/drugsforu...', 99, Array)
#1 /vault/core/controller/cp/index/vw.php(31): vw_CP_Index_Controller->_version()
#2 /library/vw/XenForo/ControllerAdmin/Wiki.php(107): vw_CP_Index_Controller->execute('version', 'post')
#3 /library/XenForo/FrontController.php(347): vw_XenForo_ControllerAdmin_Wiki->actionIndex()
#4 /library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#5 /admin.php(13): XenForo_FrontController->run()
#6 {main}
Request State
array(3) {
  ["url"] => string(56) "https://domain.com/admin.php?wiki/&panel=index"
  ["_GET"] => array(2) {
    ["wiki/"] => string(0) ""
    ["panel"] => string(5) "index"
  }
  ["_POST"] => array(4) {
    ["ajax"] => string(1) "1"
    ["_xfToken"] => string(8) "********"
    ["do"] => string(7) "version"
    ["panel"] => string(5) "index"
  }
}