Index: category_helper.php
===================================================================
--- category_helper.php	(revision 15274)
+++ category_helper.php	(working copy)
@@ -350,7 +350,11 @@
 			$templates = $this->Conn->GetCol($sql, 'CategoryId');
 
 			$base_category = $this->Application->getBaseCategory();
-			$templates[$base_category] .= '/Index'; // "Content" category will act as "Home Page"
+			
+			if ( isset($templates[$base_category]) ) {
+				// "Content" category will act as "Home Page"
+				$templates[$base_category] .= '/Index';
+			}
 
 			foreach ($page_ids as $page_id) {
 				if ( !isset($templates[$page_id]) ) {