diff --git a/api/system-current.txt b/api/system-current.txt
index b306c0f2539e9..7f8c57bedc030 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -8556,7 +8556,7 @@ package android.telephony {
   }
 
   public final class ModemActivityInfo implements android.os.Parcelable {
-    ctor public ModemActivityInfo(long, int, int, @NonNull int[], int);
+    ctor public ModemActivityInfo(long, int, int, @Nullable int[], int);
     method public int describeContents();
     method public int getIdleTimeMillis();
     method public int getReceiveTimeMillis();
diff --git a/telephony/java/android/telephony/ModemActivityInfo.java b/telephony/java/android/telephony/ModemActivityInfo.java
index d105fe3ddc71b..16fbae25199bb 100644
--- a/telephony/java/android/telephony/ModemActivityInfo.java
+++ b/telephony/java/android/telephony/ModemActivityInfo.java
@@ -17,6 +17,7 @@
 package android.telephony;
 
 import android.annotation.NonNull;
+import android.annotation.Nullable;
 import android.annotation.SystemApi;
 import android.os.Parcel;
 import android.os.Parcelable;
@@ -59,7 +60,7 @@ public final class ModemActivityInfo implements Parcelable {
     private int mRxTimeMs;
 
     public ModemActivityInfo(long timestamp, int sleepTimeMs, int idleTimeMs,
-                        @NonNull int[] txTimeMs, int rxTimeMs) {
+                        @Nullable int[] txTimeMs, int rxTimeMs) {
         mTimestamp = timestamp;
         mSleepTimeMs = sleepTimeMs;
         mIdleTimeMs = idleTimeMs;
@@ -68,10 +69,13 @@ public final class ModemActivityInfo implements Parcelable {
     }
 
     /** helper API to populate tx power range for each bucket **/
-    private void populateTransmitPowerRange(@NonNull int[] transmitPowerMs) {
+    private void populateTransmitPowerRange(@Nullable int[] transmitPowerMs) {
         int i = 0;
-        for ( ; i < Math.min(transmitPowerMs.length, TX_POWER_LEVELS); i++) {
-            mTransmitPowerInfo.add(i, new TransmitPower(TX_POWER_RANGES[i], transmitPowerMs[i]));
+        if (transmitPowerMs != null) {
+            for ( ; i < Math.min(transmitPowerMs.length, TX_POWER_LEVELS); i++) {
+                mTransmitPowerInfo.add(i,
+                        new TransmitPower(TX_POWER_RANGES[i], transmitPowerMs[i]));
+            }
         }
         // Make sure that mTransmitPowerInfo is fully initialized.
         for ( ; i < TX_POWER_LEVELS; i++) {
@@ -94,7 +98,7 @@ public final class ModemActivityInfo implements Parcelable {
         return 0;
     }
 
-    public static final @android.annotation.NonNull Parcelable.Creator<ModemActivityInfo> CREATOR =
+    public static final @NonNull Parcelable.Creator<ModemActivityInfo> CREATOR =
             new Parcelable.Creator<ModemActivityInfo>() {
         public ModemActivityInfo createFromParcel(Parcel in) {
             long timestamp = in.readLong();
@@ -149,7 +153,7 @@ public final class ModemActivityInfo implements Parcelable {
     }
 
     /** @hide */
-    public void setTransmitTimeMillis(int[] txTimeMs) {
+    public void setTransmitTimeMillis(@Nullable int[] txTimeMs) {
         populateTransmitPowerRange(txTimeMs);
     }