diff --git a/admin/element_set_ranks.php b/admin/element_set_ranks.php
index eee02384e..f097cc4e5 100644
--- a/admin/element_set_ranks.php
+++ b/admin/element_set_ranks.php
@@ -203,7 +203,7 @@ $sort_fields = array(
 
 $template->assign('image_order_options', $sort_fields);
 
-$image_order = explode(',', $category['image_order']);
+$image_order = explode(',', isset($category['image_order']) ? $category['image_order'] : "");
 
 for ($i=0; $i<3; $i++) // 3 fields
 {
diff --git a/admin/themes/default/template/album_notification.tpl b/admin/themes/default/template/album_notification.tpl
index a6dd82980..6b65b3668 100644
--- a/admin/themes/default/template/album_notification.tpl
+++ b/admin/themes/default/template/album_notification.tpl
@@ -104,7 +104,7 @@ span.errors {
   <p>
     <strong>{'Complementary mail content'|@translate}</strong>
     <br>
-    <textarea cols="50" rows="5" name="mail_content" id="mail_content" class="description">{$MAIL_CONTENT}</textarea>
+<textarea cols="50" rows="5" name="mail_content" id="mail_content" class="description">{if isset($MAIL_CONTENT)}{$MAIL_CONTENT}{/if}</textarea>
   </p>
 
 {if isset($auth_key_duration)}
diff --git a/comments.php b/comments.php
index 0029d0082..ab0f8e852 100644
--- a/comments.php
+++ b/comments.php
@@ -285,8 +285,8 @@ $template->set_filenames(array('comments'=>'comments.tpl', 'comment_list'=>'comm
 $template->assign(
   array(
     'F_ACTION'=>PHPWG_ROOT_PATH.'comments.php',
-    'F_KEYWORD'=> htmlspecialchars(stripslashes(@$_GET['keyword'])),
-    'F_AUTHOR'=> htmlspecialchars(stripslashes(@$_GET['author'])),
+    'F_KEYWORD'=> isset($_GET['keyword']) ? htmlspecialchars(stripslashes($_GET['keyword'])) : "",
+    'F_AUTHOR'=> isset($_GET['author']) ? htmlspecialchars(stripslashes($_GET['author'])) : "",
     )
   );
 
diff --git a/include/functions_html.inc.php b/include/functions_html.inc.php
index 39247d69b..8ba7051f0 100644
--- a/include/functions_html.inc.php
+++ b/include/functions_html.inc.php
@@ -532,6 +532,7 @@ function set_status_header($code, $text='')
  */
 function render_category_literal_description($desc)
 {
+  !isset($desc) ? $desc = "" : false;
   return strip_tags($desc, '<span><p><a><br><b><i><small><big><strong><em>');
 }