From 278ca264eb3e4434c121e0bd5b4c0fbea9618973 Mon Sep 17 00:00:00 2001
From: drigato <denise.rigato@sourcefabric.org>
Date: Fri, 31 Jul 2015 11:48:20 -0400
Subject: [PATCH] Fix for bringing customer to view invoice that doesn't exist
 after downgrade

---
 airtime_mvc/application/controllers/BillingController.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/airtime_mvc/application/controllers/BillingController.php b/airtime_mvc/application/controllers/BillingController.php
index b8d2b8d1a..a20f92dd6 100644
--- a/airtime_mvc/application/controllers/BillingController.php
+++ b/airtime_mvc/application/controllers/BillingController.php
@@ -164,7 +164,12 @@ class BillingController extends Zend_Controller_Action {
                     if ($apply_vat) {
                         Billing::addVatToInvoice($result["invoiceid"]);
                     }
-                    self::viewInvoice($result["invoiceid"]);
+
+                    // invoice id can be 0 if client is downgrading and they don't
+                    // owe any money
+                    if (!empty($result["invoiceid"])) {
+                        self::viewInvoice($result["invoiceid"]);
+                    }
                 }
             } else {
                 $this->view->form = $form;