From b6efcaf17c0230d5eea3f3d8a6d30e142c8d67cf Mon Sep 17 00:00:00 2001
From: Jens Mönig <jens@moenig.org>
Date: Fri, 1 May 2015 11:59:17 -0400
Subject: return empty string when querying first letter of a list

---
 threads.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/threads.js b/threads.js
index dfd89e7..165ad0e 100644
--- a/threads.js
+++ b/threads.js
@@ -83,7 +83,7 @@ ArgLabelMorph, localize, XML_Element, hex_sha512*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.threads = '2015-April-15';
+modules.threads = '2015-May-01';
 
 var ThreadManager;
 var Process;
@@ -2185,6 +2185,9 @@ Process.prototype.reportJoinWords = function (aList) {
 // Process string ops
 
 Process.prototype.reportLetter = function (idx, string) {
+    if (string instanceof List) { // catch a common user error
+        return '';
+    }
     var i = +(idx || 0),
         str = (string || '').toString();
     return str[i - 1] || '';
-- 
cgit v1.3.1