diff --git a/htdocs/core/class/conf.class.php b/htdocs/core/class/conf.class.php
index b91f6ce9ca7..f4aba2e1688 100644
--- a/htdocs/core/class/conf.class.php
+++ b/htdocs/core/class/conf.class.php
@@ -231,6 +231,7 @@ class Conf
 
 		// For backward compatibility
 		// TODO Replace this->xxx->enabled by this->modulename->enabled to remove this code
+		if ( isset($this->compta->enabled))
 		$this->compta->enabled=$this->comptabilite->enabled;
 		$this->propal->enabled=defined("MAIN_MODULE_PROPALE")?MAIN_MODULE_PROPALE:0;