diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/onehanded/OneHandedController.java b/libs/WindowManager/Shell/src/com/android/wm/shell/onehanded/OneHandedController.java
index b43daa0da2c09..bd816c314b3e4 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/onehanded/OneHandedController.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/onehanded/OneHandedController.java
@@ -481,7 +481,9 @@ public class OneHandedController implements RemoteCallable<OneHandedController>
 
     @VisibleForTesting
     void notifyExpandNotification() {
-        mMainExecutor.execute(() -> mEventCallback.notifyExpandNotification());
+        if (mEventCallback != null) {
+            mMainExecutor.execute(() -> mEventCallback.notifyExpandNotification());
+        }
     }
 
     @VisibleForTesting
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/onehanded/OneHandedControllerTest.java b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/onehanded/OneHandedControllerTest.java
index 47789b7490ee2..950900337918b 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/onehanded/OneHandedControllerTest.java
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/onehanded/OneHandedControllerTest.java
@@ -435,4 +435,17 @@ public class OneHandedControllerTest extends OneHandedTestCase {
 
         verify(mSpiedOneHandedController).notifyShortcutState(anyInt());
     }
+
+    @Test
+    public void testNotifyExpandNotification_withNullCheckProtection() {
+        when(mSpiedOneHandedController.isOneHandedEnabled()).thenReturn(false);
+        when(mSpiedTransitionState.getState()).thenReturn(STATE_NONE);
+        when(mSpiedTransitionState.isTransitioning()).thenReturn(false);
+        when(mSpiedOneHandedController.isSwipeToNotificationEnabled()).thenReturn(true);
+        mSpiedOneHandedController.setOneHandedEnabled(true);
+        mSpiedOneHandedController.notifyExpandNotification();
+
+        // Verify no NPE crash and mMockShellMainExecutor never be execute.
+        verify(mMockShellMainExecutor, never()).execute(any());
+    }
 }