Index: category.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/category/category.module,v
retrieving revision 1.124.2.2
diff -u -p -r1.124.2.2 category.module
--- category.module	2 Feb 2007 08:04:05 -0000	1.124.2.2
+++ category.module	7 Feb 2007 16:16:12 -0000
@@ -1980,7 +1980,9 @@ function _category_node_select_options($
   if ($tree) {
     foreach ($tree as $category) {
       if (!in_array($category->cid, $exclude) && node_access('view', node_load($category->cid))) {
-        $options[$category->cid] = str_repeat('-', $category->depth) . $category->title;
+        $choice = new stdClass();
+        $choice->option = array($category->cid => str_repeat('-', $category->depth) . $category->title);
+	$options[] = $choice;
       }
     }
     if (!$blank && !$value) {