XF 1.5 ErrorException: Undefined index error

[dondomainer]

Plz, how fix this error ?

ErrorException: Undefined index: host - library/XenForo/SitemapHandler/Abstract.php:90

#0 /home/mercadsfes/public_html/library/XenForo/SitemapHandler/Abstract.php(90): XenForo_Application::handlePhpError(8, 'Undefined index...', '/home/mercadsfe...', 90, Array)
#1 /home/mercadsfes/public_html/library/XenForo/SitemapHandler/Core.php(18): XenForo_SitemapHandler_Abstract->getCanonicalPaths()
#2 /home/mercadsfes/public_html/library/XenForo/Deferred/Sitemap.php(145): XenForo_SitemapHandler_Core->getRecords(0, 2000, Array)
#3 /home/mercadsfes/public_html/library/XenForo/Deferred/Sitemap.php(90): XenForo_Deferred_Sitemap->_buildSitemap(Object(XenForo_SitemapHandler_Core), 0, 7.99635505676)
#4 /home/mercadsfes/public_html/library/XenForo/Model/Deferred.php(295): XenForo_Deferred_Sitemap->execute(Array, Array, 7.99635505676, '')
#5 /home/mercadsfes/public_html/library/XenForo/Model/Deferred.php(429): XenForo_Model_Deferred->runDeferred(Array, 7.99635505676, '', false)
#6 /home/mercadsfes/public_html/library/XenForo/Model/Deferred.php(374): XenForo_Model_Deferred->_runInternal(Array, NULL, '', false)
#7 /home/mercadsfes/public_html/deferred.php(23): XenForo_Model_Deferred->run(false)
#8 {main}

array(3) {
  ["url"] => string(36) "https://www.mysite.com/deferred.php"
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(4) {
    ["_xfRequestUri"] => string(1) "/"
    ["_xfNoRedirect"] => string(1) "1"
    ["_xfToken"] => string(8) "********"
    ["_xfResponseType"] => string(4) "json"
  }
}