diff --git a/htdocs/core/class/html.formmail.class.php b/htdocs/core/class/html.formmail.class.php
index ffe22b580e7..4ce4bfee824 100644
--- a/htdocs/core/class/html.formmail.class.php
+++ b/htdocs/core/class/html.formmail.class.php
@@ -934,7 +934,7 @@ class FormMail extends Form
 					$url=getOnlinePaymentUrl(0, $typeforonlinepayment, $this->substit['__REF__']);
 					$paymenturl=$url;
 
-					$validpaymentmethod = getValidOnlinePaymentMethods($paymentmethod);
+					$validpaymentmethod = getValidOnlinePaymentMethods('');
 				}
 
 				if (count($validpaymentmethod) > 0 && $paymenturl)
diff --git a/htdocs/core/lib/payments.lib.php b/htdocs/core/lib/payments.lib.php
index d56a7e2311c..1819d8e80c5 100644
--- a/htdocs/core/lib/payments.lib.php
+++ b/htdocs/core/lib/payments.lib.php
@@ -90,7 +90,7 @@ function payment_supplier_prepare_head(Paiement $object) {
 /**
  * Return array of valid payment mode
  *
- * @param	string	$paymentmethod		Filter on this payment method
+ * @param	string	$paymentmethod		Filter on this payment method (''=none, 'paypal', ...)
  * @return	array						Array of valid payment method
  */
 function getValidOnlinePaymentMethods($paymentmethod='')