diff --git a/services/core/java/com/android/server/am/UserController.java b/services/core/java/com/android/server/am/UserController.java
index 76a994ec63e90..99c2f8a5cc566 100644
--- a/services/core/java/com/android/server/am/UserController.java
+++ b/services/core/java/com/android/server/am/UserController.java
@@ -1972,7 +1972,7 @@ class UserController implements Handler.Callback {
     }
 
     private void dismissUserSwitchDialog(Runnable onDismissed) {
-        mInjector.dismissUserSwitchingDialog(onDismissed);
+        mUiHandler.post(() -> mInjector.dismissUserSwitchingDialog(onDismissed));
     }
 
     private void showUserSwitchDialog(Pair<UserInfo, UserInfo> fromToUserPair) {
diff --git a/services/tests/servicestests/src/com/android/server/am/UserControllerTest.java b/services/tests/servicestests/src/com/android/server/am/UserControllerTest.java
index dccacb4d301ac..24a628eb43310 100644
--- a/services/tests/servicestests/src/com/android/server/am/UserControllerTest.java
+++ b/services/tests/servicestests/src/com/android/server/am/UserControllerTest.java
@@ -1342,6 +1342,10 @@ public class UserControllerTest {
             Message copy = new Message();
             copy.copyFrom(msg);
             mMessages.add(copy);
+            if (msg.getCallback() != null) {
+                msg.getCallback().run();
+                msg.setCallback(null);
+            }
             return super.sendMessageAtTime(msg, uptimeMillis);
         }
     }