From 093f21f634c8fa52cc7dbaef16c26665a9530782 Mon Sep 17 00:00:00 2001
From: Kohsuke Kawaguchi <kk@kohsuke.org>
Date: Mon, 10 Oct 2011 07:01:03 +0900
Subject: [PATCH] made the test symmetric

---
 core/src/main/java/hudson/ExtensionComponent.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/main/java/hudson/ExtensionComponent.java b/core/src/main/java/hudson/ExtensionComponent.java
index 8c48632c2c..238227f00a 100644
--- a/core/src/main/java/hudson/ExtensionComponent.java
+++ b/core/src/main/java/hudson/ExtensionComponent.java
@@ -76,7 +76,7 @@ public class ExtensionComponent<T> implements Comparable<ExtensionComponent<T>>
         if (a<b)    return 1;
 
         // make the order bit more deterministic among extensions of the same ordinal
-        if (this.instance instanceof Descriptor) {
+        if (this.instance instanceof Descriptor && that.instance instanceof Descriptor) {
             return Util.fixNull(((Descriptor)this.instance).getDisplayName()).compareTo(Util.fixNull(((Descriptor)that.instance).getDisplayName()));
         } else {
             return this.instance.getClass().getName().compareTo(that.instance.getClass().getName());