From 3511b086bc35ad44d81828e7a8e7432bd7193c58 Mon Sep 17 00:00:00 2001
From: Jeff Sharkey <jsharkey@android.com>
Date: Mon, 12 Dec 2011 18:51:26 -0800
Subject: [PATCH] Avoid NPE when missing network stats.

Bug: 5750339
Change-Id: I4b739dbd076b270a5a2b2e2a1e0f6e445d8c124e
---
 .../java/com/android/server/net/NetworkStatsService.java    | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/services/java/com/android/server/net/NetworkStatsService.java b/services/java/com/android/server/net/NetworkStatsService.java
index 871ed682e6..f6605203f5 100644
--- a/services/java/com/android/server/net/NetworkStatsService.java
+++ b/services/java/com/android/server/net/NetworkStatsService.java
@@ -1060,8 +1060,10 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
         }
 
         // clear UID from current stats snapshot
-        mLastPollUidSnapshot = mLastPollUidSnapshot.withoutUid(uid);
-        mLastPollNetworkXtSnapshot = computeNetworkXtSnapshotFromUid(mLastPollUidSnapshot);
+        if (mLastPollUidSnapshot != null) {
+            mLastPollUidSnapshot = mLastPollUidSnapshot.withoutUid(uid);
+            mLastPollNetworkXtSnapshot = computeNetworkXtSnapshotFromUid(mLastPollUidSnapshot);
+        }
 
         // clear kernel stats associated with UID
         resetKernelUidStats(uid);