diff --git a/lib/test.js b/lib/test.js
index b9d6111b..f5cf5ead 100644
--- a/lib/test.js
+++ b/lib/test.js
@@ -122,7 +122,7 @@ Test.prototype.timeoutAfter = function(ms) {
 
 Test.prototype.end = function (err) { 
     var self = this;
-    if (arguments.length >= 1) {
+    if (arguments.length >= 1 && !!err) {
         this.ifError(err);
     }