diff --git a/services/core/java/com/android/server/biometrics/sensors/face/hidl/Face10.java b/services/core/java/com/android/server/biometrics/sensors/face/hidl/Face10.java
index 85938360d4ae0..2ea752cfb9fd1 100644
--- a/services/core/java/com/android/server/biometrics/sensors/face/hidl/Face10.java
+++ b/services/core/java/com/android/server/biometrics/sensors/face/hidl/Face10.java
@@ -482,7 +482,7 @@ public class Face10 implements IHwBinder.DeathRecipient, ServiceProvider {
 
     @Override
     public long getAuthenticatorId(int sensorId, int userId) {
-        return mAuthenticatorIds.get(userId);
+        return mAuthenticatorIds.getOrDefault(userId, 0L);
     }
 
     @Override
diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21.java
index e57e675b4455a..3c67337898e89 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21.java
@@ -682,7 +682,7 @@ public class Fingerprint21 implements IHwBinder.DeathRecipient, ServiceProvider
 
     @Override
     public long getAuthenticatorId(int sensorId, int userId) {
-        return mAuthenticatorIds.get(userId);
+        return mAuthenticatorIds.getOrDefault(userId, 0L);
     }
 
     @Override
diff --git a/services/tests/servicestests/src/com/android/server/biometrics/sensors/face/hidl/Face10Test.java b/services/tests/servicestests/src/com/android/server/biometrics/sensors/face/hidl/Face10Test.java
index 99aab5c7a6af8..392535e8eea1a 100644
--- a/services/tests/servicestests/src/com/android/server/biometrics/sensors/face/hidl/Face10Test.java
+++ b/services/tests/servicestests/src/com/android/server/biometrics/sensors/face/hidl/Face10Test.java
@@ -16,6 +16,8 @@
 
 package com.android.server.biometrics.sensors.face.hidl;
 
+import static junit.framework.Assert.assertEquals;
+
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
@@ -75,6 +77,12 @@ public class Face10Test {
         mBinder = new Binder();
     }
 
+    @Test
+    public void getAuthenticatorId_doesNotCrashWhenIdNotFound() {
+        assertEquals(0, mFace10.getAuthenticatorId(0 /* sensorId */, 111 /* userId */));
+        waitForIdle();
+    }
+
     @Test
     public void scheduleRevokeChallenge_doesNotCrash() {
         mFace10.scheduleRevokeChallenge(0 /* sensorId */, 0 /* userId */, mBinder, TAG,
diff --git a/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21Test.java b/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21Test.java
index b2aeb33039f5f..61cc8e6e8ea30 100644
--- a/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21Test.java
+++ b/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/hidl/Fingerprint21Test.java
@@ -16,6 +16,8 @@
 
 package com.android.server.biometrics.sensors.fingerprint.hidl;
 
+import static junit.framework.Assert.assertEquals;
+
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
@@ -84,6 +86,12 @@ public class Fingerprint21Test {
                 mHalResultController);
     }
 
+    @Test
+    public void getAuthenticatorId_doesNotCrashWhenIdNotFound() {
+        assertEquals(0, mFingerprint21.getAuthenticatorId(0 /* sensorId */, 111 /* userId */));
+        waitForIdle();
+    }
+
     @Test
     public void halServiceDied_resetsScheduler() {
         // It's difficult to test the linkToDeath --> serviceDied path, so let's just invoke