From da92df9761b52f6d24d2241080121cc5bef5e932 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ale=C5=A1=20Smodi=C5=A1?= <aless@guru.si>
Date: Fri, 18 Sep 2015 16:41:12 +0200
Subject: Don't crash loading a prolog problem, if the problem has no plan set.

---
 js/codeq/prolog.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/codeq/prolog.js b/js/codeq/prolog.js
index 4eed354..be4791a 100644
--- a/js/codeq/prolog.js
+++ b/js/codeq/prolog.js
@@ -371,7 +371,7 @@
         editor.setValue(info.solution);
         $('#title').text(problem.slug);
         jqDescription.html(problem.description);
-        $('#btn_code_plan').prop('disabled', problem.plan.length == 0);
+        $('#btn_code_plan').prop('disabled', (problem.plan || '').length == 0);
 
         editor.on('change', function (instance, changeObj) {
             var doc = editor.getDoc(),
-- 
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