Index: /branches/release-39/php/lib/block.mtcomments.php
===================================================================
--- /branches/release-39/php/lib/block.mtcomments.php (revision 2378)
+++ /branches/release-39/php/lib/block.mtcomments.php (revision 2481)
@@ -37,7 +37,9 @@
         if ($comment['comment_commenter_id']) {
             $commenter = $ctx->mt->db->fetch_author($comment['comment_commenter_id']);
+            if (empty($commenter)) {
+                $ctx->__stash['commenter'] = null;
+            }
             $permission = $ctx->mt->db->fetch_permission(array('blog_id' => $comment['comment_blog_id'], 'id' => $comment['comment_commenter_id']));
-            if ( isset($permission) && count($permission) > 0 ) {
-                $commenter = array($commenter);
+            if (!empty($permission)) {
                 $commenter = array_merge($commenter, $permission[0]);
             }