diff --git a/htdocs/core/class/commondocgenerator.class.php b/htdocs/core/class/commondocgenerator.class.php
index fbf5363b753..9e5a00bb650 100644
--- a/htdocs/core/class/commondocgenerator.class.php
+++ b/htdocs/core/class/commondocgenerator.class.php
@@ -32,6 +32,18 @@
 abstract class CommonDocGenerator
 {
 	var $error='';
+	protected $db;
+	
+	
+	/**
+	 *	Constructor
+	 *
+	 *  @param		DoliDB		$db      Database handler
+	*/
+	public function __construct($db) {
+		$this->db = $db;
+		return 1;
+	}
 
 
     /**