diff --git a/config.php b/config.php
index 30ee208..1a88a08 100755
--- a/config.php
+++ b/config.php
@@ -2707,10 +2707,10 @@ class SearchEngine extends PhpObject
 		$sWords = implode(self::KEYWORDS_SEPARATOR, $asWords);
 		$sWords = mb_strtolower(str_replace("\n", self::KEYWORDS_SEPARATOR, $sWords));
 		//TODO Fix char encoding
-		$sWords = preg_replace('/(\W+)/', self::KEYWORDS_SEPARATOR, $sWords); //remove all non-word characters
+		$sWords = preg_replace('/(\W+)/u', self::KEYWORDS_SEPARATOR, $sWords); //remove all non-word characters
 		
 		//Add / Modify search database
-		$asData = array('id_item'=>$iItemId, 'type'=>$sType, 'refer_id'=>$asItemData['refer_id'], 'keywords'=>$sWords);
+		$asData = array('id_item'=>$iItemId, 'type'=>$sType, 'refer_id'=>(array_key_exists('refer_id', $asItemData)?$asItemData['refer_id']:0), 'keywords'=>$sWords);
 		$this->oMySql->insertUpdateRow(MySqlManager::SEARCH_TABLE, $asData, array('id_item', 'type'));
 	}