diff --git a/services/core/java/com/android/server/biometrics/sensors/face/aidl/Sensor.java b/services/core/java/com/android/server/biometrics/sensors/face/aidl/Sensor.java
index c6f39aa07f265..3eb4759213047 100644
--- a/services/core/java/com/android/server/biometrics/sensors/face/aidl/Sensor.java
+++ b/services/core/java/com/android/server/biometrics/sensors/face/aidl/Sensor.java
@@ -424,6 +424,12 @@ public class Sensor {
             });
         }
 
+        @Override
+        public void onSessionClosed() {
+            mHandler.post(() -> {
+              // TODO: implement this.
+            });
+        }
     }
 
     Sensor(@NonNull String tag, @NonNull FaceProvider provider, @NonNull Context context,
diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/Sensor.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/Sensor.java
index 5631647816ec3..d843bc94455c4 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/Sensor.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/Sensor.java
@@ -403,6 +403,13 @@ class Sensor {
                 invalidationClient.onAuthenticatorIdInvalidated(newAuthenticatorId);
             });
         }
+
+        @Override
+        public void onSessionClosed() {
+            mHandler.post(() -> {
+              // TODO: implement this.
+            });
+        }
     }
 
     Sensor(@NonNull String tag, @NonNull FingerprintProvider provider, @NonNull Context context,