From 26490144164ffc95a5649c18c398a5a85938a168 Mon Sep 17 00:00:00 2001
From: YuviPanda <yuvipanda@gmail.com>
Date: Sun, 24 Feb 2013 01:53:57 +0530
Subject: [PATCH] Guard against a potential NPE

---
 .../wikimedia/commons/contributions/ContributionsActivity.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/commons/src/main/java/org/wikimedia/commons/contributions/ContributionsActivity.java b/commons/src/main/java/org/wikimedia/commons/contributions/ContributionsActivity.java
index e1467110a..7b117b1c1 100644
--- a/commons/src/main/java/org/wikimedia/commons/contributions/ContributionsActivity.java
+++ b/commons/src/main/java/org/wikimedia/commons/contributions/ContributionsActivity.java
@@ -195,7 +195,7 @@ public  class       ContributionsActivity
     }
 
     public void onBackStackChanged() {
-        if(mediaDetails.isVisible()) {
+        if(mediaDetails != null && mediaDetails.isVisible()) {
             getSupportActionBar().setDisplayHomeAsUpEnabled(true);
         } else {
             getSupportActionBar().setDisplayHomeAsUpEnabled(false);