From fb02d4a7478a11f0ec2c87f8bf0073086dafe4a5 Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <alec@alec.pl>
Date: Sun, 1 Oct 2017 17:52:16 +0200
Subject: [PATCH] Fix error when calling show_popup_dialog() with no 4th
 argument

---
 program/js/app.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/program/js/app.js b/program/js/app.js
index e4ed0d218..9bcd56e64 100644
--- a/program/js/app.js
+++ b/program/js/app.js
@@ -7776,7 +7776,7 @@ function rcube_webmail()
         return button;
       };
 
-    if (options.button_classes)
+    if (options && options.button_classes)
       $.each(buttons, function(idx, button) {
         var cl = options.button_classes[i];
         if (cl)