diff --git a/htdocs/lib/webcal.class.php b/htdocs/lib/webcal.class.php
index 2d3b81d788c..f6364c099ce 100644
--- a/htdocs/lib/webcal.class.php
+++ b/htdocs/lib/webcal.class.php
@@ -78,7 +78,7 @@ class Webcal {
 {
         global $langs;
         
-        dolibarr_syslog("Webcal::add user=".$user);
+        dolibarr_syslog("Webcal::add user=".$user->id);
 
         // Test si login webcal défini pour le user
         if (! $user->webcal_login)