check if SiteTree exists before getting pages.
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@ -143,7 +143,7 @@ class GoogleSitemap extends Controller {
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$filter = "{$bt}ShowInSearch{$bt} = 1";
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}
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$pages = Versioned::get_by_stage('SiteTree', 'Live', $filter);
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$pages = class_exists('SiteTree') ? Versioned::get_by_stage('SiteTree', 'Live', $filter) : false;
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$newPages = new ArrayList();
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