diff --git a/_config.php b/_config.php
index a49331d..3b625d0 100644
--- a/_config.php
+++ b/_config.php
@@ -3,8 +3,8 @@
 Object::add_extension('SiteTree', 'SiteTreeContentReview');
 
 
-if(class_exists('Subsite')) {
+if(class_exists('Subsite') && class_exists('SubsiteReportWrapper')){
 	SS_Report::register('ReportAdmin', 'SubsiteReportWrapper("PagesDueForReviewReport")',20);
 } else {
 	SS_Report::register('ReportAdmin', 'PagesDueForReviewReport',20);
-}
\ No newline at end of file
+}