1 files changed, 3 insertions, 1 deletions
diff --git a/threads.js b/threads.js
index 8b0e25b..9b347f9 100644
--- a/threads.js
+++ b/threads.js
@@ -83,7 +83,7 @@ ArgLabelMorph, localize, XML_Element, hex_sha512*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.threads = '2013-October-09';
+modules.threads = '2013-October-17';
 
 var ThreadManager;
 var Process;
@@ -1318,6 +1318,8 @@ Process.prototype.doIfElse = function () {
     } else {
         if (args[2]) {
             this.pushContext(args[2].blockSequence(), outer);
+        } else {
+            this.pushContext('doYield');
         }
     }
     if (this.context) {