Fix NPE in usage stats manager (recent regression)

Change-Id: I305bb64b11c9240dc0df5d7b08a9a970660157c8
Fix: 38430177
Test: build and boot

1 files changed, 3 insertions, 0 deletions

diff --git a/services/usage/java/com/android/server/usage/UsageStatsService.java b/services/usage/java/com/android/server/usage/UsageStatsService.java
index 0de3c7c75016..912e7a81cdfa 100644
--- a/services/usage/java/com/android/server/usage/UsageStatsService.java
+++ b/services/usage/java/com/android/server/usage/UsageStatsService.java
@@ -831,6 +831,9 @@ public class UsageStatsService extends SystemService implements
             final UserUsageStatsService service =
                     getUserDataAndInitializeIfNeededLocked(userId, timeNow);
             List<UsageStats> list = service.queryUsageStats(bucketType, beginTime, endTime);
+            if (list == null) {
+                return null;
+            }
 
             // Mangle instant app names *using their current state (not whether they were ephemeral
             // when the data was recorded)*.