From de175d5d5257c882e80309475ebc8b24a29d78e5 Mon Sep 17 00:00:00 2001
From: Josh de Leeuw <josh.deleeuw@gmail.com>
Date: Wed, 21 Oct 2020 17:41:53 -0400
Subject: [PATCH] add error message when timeline is empty throw a useful error
 message when the timeline is empty #853

---
 jspsych.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/jspsych.js b/jspsych.js
index eb5d3f80..dd844378 100755
--- a/jspsych.js
+++ b/jspsych.js
@@ -57,6 +57,10 @@ window.jsPsych = (function() {
       console.error('No timeline declared in jsPsych.init. Cannot start experiment.')
     }
 
+    if(options.timeline.length == 0){
+      console.error('No trials have been added to the timeline (the timeline is an empty array). Cannot start experiment.')
+    }
+
     // reset variables
     timeline = null;
     global_trial_index = 0;