=== modified file 'modules/help.module'
--- modules/help.module	
+++ modules/help.module	
@@ -74,12 +74,14 @@
   sort($modules);
 
   // Output pretty four-column list
-  $break = ceil(count($modules) / 4);
+  $count = count($modules);
+  $break = ceil($count / 4);
   $output = '<div class="help-items"><ul>';
   foreach ($modules as $i => $module) {
     $output .= '<li>'. l(t($module), 'admin/help/'. $module) .'</li>';
-    if (($i + 1) % $break == 0) {
-      $output .= '</ul></div><div class="help-items'. ($i + 1 == $break * 3 ? ' help-items-last' : '') .'"><ul>';
+    $j = $i + 1;
+    if (($j % $break) == 0 && $j < $count) {
+      $output .= '</ul></div><div class="help-items'. ($j == $break * 3 ? ' help-items-last' : '') .'"><ul>';
     }
   }
   $output .= '</ul></div><br class="clear" />';