diff --git a/core/java/com/android/internal/app/ShutdownThread.java b/core/java/com/android/internal/app/ShutdownThread.java
index a96253b..e35edc3 100644
--- a/core/java/com/android/internal/app/ShutdownThread.java
+++ b/core/java/com/android/internal/app/ShutdownThread.java
@@ -133,6 +133,10 @@
 
     private static void beginShutdownSequence(Context context) {
         synchronized (sIsStartedGuard) {
+            if (sIsStarted) {
+                Log.d(TAG, "Shutdown sequence already running, returning.");
+                return;
+            }
             sIsStarted = true;
         }