diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index 197d9eccefa08..637061d090232 100644
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -3525,7 +3525,9 @@ public final class ActivityStackSupervisor implements DisplayListener {
     }
 
     void showLockTaskToast() {
-        mLockTaskNotify.showToast(mLockTaskModeState);
+        if (mLockTaskNotify != null) {
+            mLockTaskNotify.showToast(mLockTaskModeState);
+        }
     }
 
     void showLockTaskEscapeMessageLocked(TaskRecord task) {