Index: /branches/release-38/php/lib/block.mtcomments.php
===================================================================
--- /branches/release-38/php/lib/block.mtcomments.php (revision 2326)
+++ /branches/release-38/php/lib/block.mtcomments.php (revision 2378)
@@ -38,5 +38,8 @@
             $commenter = $ctx->mt->db->fetch_author($comment['comment_commenter_id']);
             $permission = $ctx->mt->db->fetch_permission(array('blog_id' => $comment['comment_blog_id'], 'id' => $comment['comment_commenter_id']));
-            $commenter = array_merge($commenter, $permission[0]);
+            if ( isset($permission) && count($permission) > 0 ) {
+                $commenter = array($commenter);
+                $commenter = array_merge($commenter, $permission[0]);
+            }
             $ctx->stash('commenter', $commenter);
         } else {