From 5d31a93bf0b4215e4b8009b63bf87bdf83915dbc Mon Sep 17 00:00:00 2001
From: daraelmin <daraelmin@gmail.com>
Date: Fri, 26 Feb 2021 08:20:51 +0100
Subject: [PATCH] Fix #16420 - undefined $model_mail_selected_id

Set $model_mail_selected_id to 0 when it is undefined
---
 htdocs/core/class/html.formmail.class.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/htdocs/core/class/html.formmail.class.php b/htdocs/core/class/html.formmail.class.php
index 2b551ed14d1cb..729be941d518c 100644
--- a/htdocs/core/class/html.formmail.class.php
+++ b/htdocs/core/class/html.formmail.class.php
@@ -455,7 +455,7 @@ public function get_form($addfileaction = 'addfile', $removefileaction = 'remove
 			// Zone to select email template
 			if (count($modelmail_array) > 0)
 			{
-				$model_mail_selected_id = GETPOSTISSET('modelmailselected') ? GETPOST('modelmailselected', 'int') : $arraydefaultmessage->id;
+				$model_mail_selected_id = GETPOSTISSET('modelmailselected') ? GETPOST('modelmailselected', 'int') : ( ($arraydefaultmessage->id) ? $arraydefaultmessage->id : 0 );
 
 				// If list of template is filled
 				$out .= '<div class="center" style="padding: 0px 0 12px 0">'."\n";