Index: branches/5.0.x/core/units/categories/categories_tag_processor.php
===================================================================
diff -u -r12497 -r12511
--- branches/5.0.x/core/units/categories/categories_tag_processor.php	(.../categories_tag_processor.php)	(revision 12497)
+++ branches/5.0.x/core/units/categories/categories_tag_processor.php	(.../categories_tag_processor.php)	(revision 12511)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: categories_tag_processor.php 12497 2009-09-15 16:17:08Z alex $
+* @version	$Id: categories_tag_processor.php 12511 2009-09-15 19:27:06Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -202,7 +202,7 @@
 		$cat_object =& $this->Application->recallObject($this->getPrefixSpecial(), $this->Prefix.'_List');
 		$sql = 'SELECT '.$this->getTitleField().'
 				FROM '.$cat_object->TableName.'
-				WHERE CategoryId = '.$this->Application->GetVar('m_cat_id');
+				WHERE CategoryId = '.(int)$this->Application->GetVar('m_cat_id');
 		return $this->Conn->GetOne($sql);
 	}
 
@@ -696,7 +696,7 @@
 		if (!isset($current_path)) {
 			$sql = 'SELECT ParentPath
 					FROM ' . TABLE_PREFIX . 'Category
-					WHERE CategoryId = ' . $this->Application->GetVar('m_cat_id');
+					WHERE CategoryId = ' . (int)$this->Application->GetVar('m_cat_id');
 			$current_path = $this->Conn->GetOne($sql);
 		}
 
@@ -1056,7 +1056,12 @@
 				}
 				else {
 					// no relation with current category object -> query from db
-					$sql = 'SELECT l' . $this->Application->GetVar('m_lang') . '_CachedNavbar
+					$language_id = (int)$this->Application->GetVar('m_lang');
+					if (!$language_id) {
+						$language_id = 1;
+					}
+
+					$sql = 'SELECT l' . $language_id . '_CachedNavbar
 							FROM ' . $object->TableName . '
 							WHERE ' . $object->IDField . ' = ' . $category_id;
 					$cached_navbar = $this->Conn->GetOne($sql);
@@ -2022,8 +2027,12 @@
 		$id_field = $this->Application->getUnitOption($this->Prefix, 'IDField');
 		$table_name = $this->Application->getUnitOption($this->Prefix, 'TableName');
 
-		$language = $this->Application->GetVar('m_lang');
+		$language = (int)$this->Application->GetVar('m_lang');
 
+		if (!$language) {
+			$language = 1;
+		}
+
 		$sql = 'SELECT l'.$language.'_Name AS Name, NamedParentPath
 				FROM '.$table_name.'
 				WHERE '.$id_field.' IN ('.implode(',', $category_ids).')';