Check if UserState is null in stopGuestOrEphemeralUserIfBackground

- UserState may be removed from mStartedUsers if it has already been stopped

Bug: 72133858
Test: Manually create secondary user, and exit the user in SetupWizard
Change-Id: I92783f89a9d4de9a7eca81e688b4e115c2f5535a

1 files changed, 1 insertions, 1 deletions

diff --git a/services/core/java/com/android/server/am/UserController.java b/services/core/java/com/android/server/am/UserController.java
index c7210a835767..65bebc6c235a 100644
--- a/services/core/java/com/android/server/am/UserController.java
+++ b/services/core/java/com/android/server/am/UserController.java
@@ -796,7 +796,7 @@ class UserController implements Handler.Callback {
     private void stopGuestOrEphemeralUserIfBackground(int oldUserId) {
         if (DEBUG_MU) Slog.i(TAG, "Stop guest or ephemeral user if background: " + oldUserId);
         UserState oldUss = mStartedUsers.get(oldUserId);
-        if (oldUserId == UserHandle.USER_SYSTEM || oldUserId == mCurrentUserId
+        if (oldUserId == UserHandle.USER_SYSTEM || oldUserId == mCurrentUserId || oldUss == null
                 || oldUss.state == UserState.STATE_STOPPING
                 || oldUss.state == UserState.STATE_SHUTDOWN) {
             return;