Index: trunk/content/plugins/categories/categories.php
===================================================================
--- trunk/content/plugins/categories/categories.php	(revision 1190)
+++ trunk/content/plugins/categories/categories.php	(revision 1201)
@@ -154,5 +154,5 @@
             $cat_meta = $h->getCatMeta($h->vars['category_id']);
             
-            if ($cat_meta->category_desc) {
+            if (isset($cat_meta->category_desc)) {
                 echo '<meta name="description" content="' . urldecode($cat_meta->category_desc) . '" />' . "\n";
             } else {
@@ -160,5 +160,5 @@
             }
             
-            if ($cat_meta->category_keywords) {
+            if (isset($cat_meta->category_keywords)) {
                 echo '<meta name="keywords" content="' . urldecode($cat_meta->category_keywords) . '" />' . "\n";
             } else {