diff --git a/services/core/java/com/android/server/am/BatteryStatsService.java b/services/core/java/com/android/server/am/BatteryStatsService.java
index 207c10c44c9bb..2a2e7839288fa 100644
--- a/services/core/java/com/android/server/am/BatteryStatsService.java
+++ b/services/core/java/com/android/server/am/BatteryStatsService.java
@@ -822,7 +822,10 @@ public final class BatteryStatsService extends IBatteryStats.Stub
 
                     final long sessionStart = mBatteryUsageStatsStore
                             .getLastBatteryUsageStatsBeforeResetAtomPullTimestamp();
-                    final long sessionEnd = mStats.getStartClockTime();
+                    final long sessionEnd;
+                    synchronized (mStats) {
+                        sessionEnd = mStats.getStartClockTime();
+                    }
                     final BatteryUsageStatsQuery queryBeforeReset =
                             new BatteryUsageStatsQuery.Builder()
                                     .setMaxStatsAgeMs(0)