diff --git a/htdocs/core/tpl/card_presend.tpl.php b/htdocs/core/tpl/card_presend.tpl.php
index 148def445bb..025692d6199 100644
--- a/htdocs/core/tpl/card_presend.tpl.php
+++ b/htdocs/core/tpl/card_presend.tpl.php
@@ -213,7 +213,14 @@ if ($action == 'presend') {
 		$formmail->setSubstitFromObject($object, $langs);
 	}
 	$substitutionarray = getCommonSubstitutionArray($outputlangs, 0, $arrayoffamiliestoexclude, $object);
-	$substitutionarray['__CHECK_READ__'] = (is_object($object) && is_object($object->thirdparty)) ? '<img src="'.DOL_MAIN_URL_ROOT.'/public/emailing/mailing-read.php?tag='.urlencode($object->thirdparty->tag).'&securitykey='.urlencode($conf->global->MAILING_EMAIL_UNSUBSCRIBE_KEY).'" width="1" height="1" style="width:1px;height:1px" border="0"/>' : '';
+	$substitutionarray['__CHECK_READ__'] = "";
+	if (is_object($object) && is_object($object->thirdparty)) {
+		$checkRead= '<img src="'.DOL_MAIN_URL_ROOT.'/public/emailing/mailing-read.php';
+		$checkRead.='?tag='.(!empty($object->thirdparty->tag)?urlencode($object->thirdparty->tag):"");
+		$checkRead.='&securitykey='.(!empty($conf->global->MAILING_EMAIL_UNSUBSCRIBE_KEY)?urlencode($conf->global->MAILING_EMAIL_UNSUBSCRIBE_KEY):"");
+		$checkRead.='" width="1" height="1" style="width:1px;height:1px" border="0"/>';
+		$substitutionarray['__CHECK_READ__'] = $checkRead;
+	}
 	$substitutionarray['__PERSONALIZED__'] = ''; // deprecated
 	$substitutionarray['__CONTACTCIVNAME__'] = '';
 	$parameters = array(