From 5db2b5951ff3d8502c8ef5baf941df3cc202061a Mon Sep 17 00:00:00 2001
From: skodak <skodak>
Date: Mon, 27 Jul 2009 15:14:49 +0000
Subject: [PATCH] MDL-19756 better broken param diag

---
 lib/outputlib.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/outputlib.php b/lib/outputlib.php
index 16335feaee..0dc8a6504c 100644
--- a/lib/outputlib.php
+++ b/lib/outputlib.php
@@ -2435,7 +2435,7 @@ class moodle_core_renderer extends moodle_renderer_base {
      * @return string HTML fragment
      */
     public function button($form) {
-        if (empty($form->button)) {
+        if (empty($form->button) or !($form->button instanceof html_button)) {
             throw new coding_exception('$OUTPUT->button($form) requires $form to have a button (html_button) value');
         }
 
-- 
2.39.5