diff --git a/htdocs/modulebuilder/template/class/myobject.class.php b/htdocs/modulebuilder/template/class/myobject.class.php
index a93d2fa6565..49aa42ad96d 100644
--- a/htdocs/modulebuilder/template/class/myobject.class.php
+++ b/htdocs/modulebuilder/template/class/myobject.class.php
@@ -443,8 +443,12 @@ class MyObject extends CommonObject
 	{
 		global $conf, $langs;
 
+		$this->output = '';
+		$this->error='';
+
 		dol_syslog(__METHOD__, LOG_DEBUG);
 
+		// ...
 
 		return 0;
 	}