diff --git a/src/com/android/settings/fuelgauge/batterytip/BatteryDatabaseManager.java b/src/com/android/settings/fuelgauge/batterytip/BatteryDatabaseManager.java
index 58e9d03ef5c..772660a69d3 100644
--- a/src/com/android/settings/fuelgauge/batterytip/BatteryDatabaseManager.java
+++ b/src/com/android/settings/fuelgauge/batterytip/BatteryDatabaseManager.java
@@ -16,6 +16,8 @@
 
 package com.android.settings.fuelgauge.batterytip;
 
+import static android.database.sqlite.SQLiteDatabase.CONFLICT_IGNORE;
+
 import static com.android.settings.fuelgauge.batterytip.AnomalyDatabaseHelper.AnomalyColumns
         .ANOMALY_STATE;
 import static com.android.settings.fuelgauge.batterytip.AnomalyDatabaseHelper.AnomalyColumns
@@ -64,12 +66,15 @@ public class BatteryDatabaseManager {
     /**
      * Insert an anomaly log to database.
      *
+     * @param uid          the uid of the app
      * @param packageName  the package name of the app
      * @param type         the type of the anomaly
      * @param anomalyState the state of the anomaly
      * @param timestampMs  the time when it is happened
+     * @return {@code true} if insert operation succeed
      */
-    public synchronized void insertAnomaly(int uid, String packageName, int type, int anomalyState,
+    public synchronized boolean insertAnomaly(int uid, String packageName, int type,
+            int anomalyState,
             long timestampMs) {
         try (SQLiteDatabase db = mDatabaseHelper.getWritableDatabase()) {
             ContentValues values = new ContentValues();
@@ -78,7 +83,7 @@ public class BatteryDatabaseManager {
             values.put(ANOMALY_TYPE, type);
             values.put(ANOMALY_STATE, anomalyState);
             values.put(TIME_STAMP_MS, timestampMs);
-            db.insert(TABLE_ANOMALY, null, values);
+            return db.insertWithOnConflict(TABLE_ANOMALY, null, values, CONFLICT_IGNORE) != -1;
         }
     }
 
diff --git a/tests/unit/src/com/android/settings/fuelgauge/batterytip/RestrictAppTest.java b/tests/unit/src/com/android/settings/fuelgauge/batterytip/RestrictAppTest.java
index 5d68c76e641..a24a17ae070 100644
--- a/tests/unit/src/com/android/settings/fuelgauge/batterytip/RestrictAppTest.java
+++ b/tests/unit/src/com/android/settings/fuelgauge/batterytip/RestrictAppTest.java
@@ -21,6 +21,8 @@ import static android.support.test.espresso.assertion.ViewAssertions.matches;
 import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
 import static android.support.test.espresso.matcher.ViewMatchers.withText;
 
+import static com.google.common.truth.Truth.assertThat;
+
 import android.app.Instrumentation;
 import android.content.Context;
 import android.content.Intent;
@@ -33,6 +35,7 @@ import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
+import java.util.List;
 import java.util.concurrent.TimeUnit;
 
 @RunWith(AndroidJUnit4.class)
@@ -41,6 +44,8 @@ public class RestrictAppTest {
     private static final String BATTERY_INTENT = "android.intent.action.POWER_USAGE_SUMMARY";
     private static final String PACKAGE_SETTINGS = "com.android.settings";
     private static final String PACKAGE_SYSTEM_UI = "com.android.systemui";
+    private static final int ANOMALY_TYPE =
+            StatsManagerConfig.AnomalyType.EXCESSIVE_WAKELOCK_ALL_SCREEN_OFF;
 
     private BatteryDatabaseManager mBatteryDatabaseManager;
     private PackageManager mPackageManager;
@@ -58,7 +63,7 @@ public class RestrictAppTest {
     public void batterySettings_hasOneAnomaly_showAnomaly() throws
             PackageManager.NameNotFoundException {
         mBatteryDatabaseManager.insertAnomaly(mPackageManager.getPackageUid(PACKAGE_SETTINGS, 0),
-                PACKAGE_SETTINGS, 1,
+                PACKAGE_SETTINGS, ANOMALY_TYPE,
                 AnomalyDatabaseHelper.State.NEW, System.currentTimeMillis());
 
         Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation();
@@ -70,10 +75,10 @@ public class RestrictAppTest {
     public void batterySettings_hasTwoAnomalies_showAnomalies() throws
             PackageManager.NameNotFoundException {
         mBatteryDatabaseManager.insertAnomaly(mPackageManager.getPackageUid(PACKAGE_SETTINGS, 0),
-                PACKAGE_SETTINGS, 1,
+                PACKAGE_SETTINGS, ANOMALY_TYPE,
                 AnomalyDatabaseHelper.State.NEW, System.currentTimeMillis());
         mBatteryDatabaseManager.insertAnomaly(mPackageManager.getPackageUid(PACKAGE_SYSTEM_UI, 0),
-                PACKAGE_SYSTEM_UI, 1,
+                PACKAGE_SYSTEM_UI, ANOMALY_TYPE,
                 AnomalyDatabaseHelper.State.NEW, System.currentTimeMillis());
 
         Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation();
@@ -95,4 +100,26 @@ public class RestrictAppTest {
         instrumentation.startActivitySync(new Intent(BATTERY_INTENT));
         onView(withText("2 apps recently restricted")).check(matches(isDisplayed()));
     }
+
+    @Test
+    public void insertDuplicateAnomalies_onlyInsertOnce() throws
+            PackageManager.NameNotFoundException {
+        final int uid = mPackageManager.getPackageUid(PACKAGE_SETTINGS, 0);
+        final long now = System.currentTimeMillis();
+
+        // Insert same anomaly twice, it fails at the second time.
+        assertThat(mBatteryDatabaseManager.insertAnomaly(uid, PACKAGE_SETTINGS, ANOMALY_TYPE,
+                AnomalyDatabaseHelper.State.NEW, now)).isTrue();
+        assertThat(mBatteryDatabaseManager.insertAnomaly(uid, PACKAGE_SETTINGS, ANOMALY_TYPE,
+                AnomalyDatabaseHelper.State.NEW, now)).isFalse();
+
+        // In database, only contains one row
+        List<AppInfo> newAppInfos = mBatteryDatabaseManager.queryAllAnomalies(0,
+                AnomalyDatabaseHelper.State.NEW);
+        assertThat(newAppInfos).containsExactly(new AppInfo.Builder()
+                .setUid(uid)
+                .setPackageName(PACKAGE_SETTINGS)
+                .addAnomalyType(ANOMALY_TYPE)
+                .build());
+    }
 }