diff --git a/htdocs/core/class/html.formactions.class.php b/htdocs/core/class/html.formactions.class.php
index 2d66661c839..bd22470d952 100644
--- a/htdocs/core/class/html.formactions.class.php
+++ b/htdocs/core/class/html.formactions.class.php
@@ -196,7 +196,7 @@ class FormActions
 
 			if (! empty($conf->agenda->enabled))
 			{
-				$buttontoaddnewevent = '<a href="'.DOL_URL_ROOT.'/comm/action/card.php?action=create&datep='.dol_print_date(dol_now(),'dayhourlog').'&origin='.$typeelement.'&originid='.$object->id.($object->socid>0?'&socid='.$object->socid:'').($projectid>0?'&projectid='.$projectid:'').'&backtopage='.urlencode($urlbacktopage).'">';
+				$buttontoaddnewevent = '<a href="'.DOL_URL_ROOT.'/comm/action/card.php?action=create&datep='.dol_print_date(dol_now(),'dayhourlog').'&origin='.$typeelement.'&originid='.$object->id.($object->socid>0?'&socid='.$object->socid:($socid>0?'&socid='.$socid:'')).($projectid>0?'&projectid='.$projectid:'').'&backtopage='.urlencode($urlbacktopage).'">';
 				$buttontoaddnewevent.= $langs->trans("AddEvent");
 				$buttontoaddnewevent.= '</a>';
 			}