Issue: Server Error

ErrorException: Invalid argument supplied for foreach() - library/vw/XenForo/SitemapHandler/Base.php:51
Generated By: Unknown Account, Yesterday at 1:38 AM
Stack Trace
#0 /home/mario/public_html/saverocity.com/public/forum/library/vw/XenForo/SitemapHandler/Base.php(51): XenForo_Application::handlePhpError(2, 'Invalid argumen...', '/home/mario/pub...', 51, Array)
#1 /home/mario/public_html/saverocity.com/public/forum/library/XenForo/Deferred/Sitemap.php(145): vw_XenForo_SitemapHandler_Base->getRecords(0, 2000, Array)
#2 /home/mario/public_html/saverocity.com/public/forum/library/XenForo/Deferred/Sitemap.php(90): XenForo_Deferred_Sitemap->_buildSitemap(Object(vw_XenForo_SitemapHandler_vwComment), 0, 7.9999959468842)
#3 /home/mario/public_html/saverocity.com/public/forum/library/XenForo/Model/Deferred.php(294): XenForo_Deferred_Sitemap->execute(Array, Array, 7.9999959468842, '')
#4 /home/mario/public_html/saverocity.com/public/forum/library/XenForo/Model/Deferred.php(428): XenForo_Model_Deferred->runDeferred(Array, 7.9999959468842, '', false)
#5 /home/mario/public_html/saverocity.com/public/forum/library/XenForo/Model/Deferred.php(373): XenForo_Model_Deferred->_runInternal(Array, NULL, '', false)
#6 /home/mario/public_html/saverocity.com/public/forum/deferred.php(23): XenForo_Model_Deferred->run(false)
#7 {main}
Request State
array(3) {
  ["url"] => string(41) "https://saverocity.com/forum/deferred.php"
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(4) {
    ["_xfRequestUri"] => string(45) "/forum/threads/problem-with-new-mbvgc.232185/"
    ["_xfNoRedirect"] => string(1) "1"
    ["_xfToken"] => string(8) "********"
    ["_xfResponseType"] => string(4) "json"
  }