Index: karma.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/karma/karma.module,v
retrieving revision 1.20
diff -u -r1.20 karma.module
--- karma.module	26 May 2006 21:49:25 -0000	1.20
+++ karma.module	23 Oct 2006 05:05:59 -0000
@@ -366,6 +366,11 @@
 
 function karma_comment_ratings_page($cid) {
   $comment = db_fetch_object(db_query('SELECT n.nid, c.cid, c.subject, n.title AS node_title FROM {comments} c LEFT JOIN {node} n ON c.nid = n.nid WHERE c.cid = %d', $cid));
+  if(!$comment->cid) {
+    drupal_not_found();
+    exit;
+  }
+
   menu_set_location(array(
     array('path' => 'node/'. $comment->nid, 'title' => $comment->node_title),
     array('path' => 'karma/'. $comment->cid, 'title' => t('Ratings for %subject', array('%subject' => $comment->subject))),
@@ -380,8 +385,8 @@
   }
   $header = array(t('User'), t('Rating'));
   $output = theme('table', $header, $rows);
-
-  $output .= '<p id="karma-average">'. t('Average rating: %average', array('%average' => $rating_sum / db_num_rows($ratings))) .'</p>';
+  $rows = db_num_rows($ratings);
+  $output .= '<p id="karma-average">'. t('Average rating: %average', array('%average' => ($rows ? ($rating_sum / $rows) : '0' ))) .'</p>';
 
   $output .= theme('links', array(l(t('Back to %title', array('%title' => theme('placeholder', $comment->node_title))), 'node/'. $comment->nid, array(), NULL, 'comment-'. $comment->cid, FALSE, TRUE)));