From f83aa5a20c898bd3dfd0c4863f0197d0e148a903 Mon Sep 17 00:00:00 2001
From: Josh de Leeuw <josh.deleeuw@gmail.com>
Date: Wed, 17 Dec 2014 12:37:55 -0500
Subject: [PATCH] bug fix for undefined preamble param

---
 plugins/jspsych-survey-likert.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/jspsych-survey-likert.js b/plugins/jspsych-survey-likert.js
index a8ccb939..a27d03ca 100644
--- a/plugins/jspsych-survey-likert.js
+++ b/plugins/jspsych-survey-likert.js
@@ -20,7 +20,7 @@
       var trials = [];
       for (var i = 0; i < params.questions.length; i++) {
         trials.push({
-          preamble: params.preamble[i] || "",
+          preamble: (typeof params.preamble === 'undefined') ? "" : params.preamble[i],
           questions: params.questions[i],
           labels: params.labels[i],
           intervals: params.intervals[i],