Index: /branches/release-33/lib/MT/CMS/Template.pm
===================================================================
--- /branches/release-33/lib/MT/CMS/Template.pm (revision 1770)
+++ /branches/release-33/lib/MT/CMS/Template.pm (revision 1775)
@@ -15,6 +15,10 @@
     my $can_preview = 0;
 
-    $param->{include_system} = $blog->include_system;
-    $param->{include_cache} = $blog->include_cache;
+    if ($blog) {
+        # include_system/include_cache are only applicable
+        # to blog-level templates
+        $param->{include_system} = $blog->include_system;
+        $param->{include_cache} = $blog->include_cache;
+    }
 
     if ($id) {