diff --git a/htdocs/core/customreports.php b/htdocs/core/customreports.php
index 75ee1126897..ca00f4fe84e 100644
--- a/htdocs/core/customreports.php
+++ b/htdocs/core/customreports.php
@@ -121,6 +121,7 @@ $hookmanager->initHooks(array('customreport')); // Note that conf->hooks_modules
 
 $title = '';
 $picto = '';
+$errormessage = null;
 $head = array();
 $ObjectClassName = '';
 // Objects available by default