diff --git a/services/core/java/com/android/server/wm/DragDropController.java b/services/core/java/com/android/server/wm/DragDropController.java
index 4ce0581530035..aa8ebf763beca 100644
--- a/services/core/java/com/android/server/wm/DragDropController.java
+++ b/services/core/java/com/android/server/wm/DragDropController.java
@@ -342,6 +342,11 @@ class DragDropController {
     }
 
     void reportDropWindow(IBinder token, float x, float y) {
+        if (mDragState == null) {
+            Slog.w(TAG_WM, "Drag state is closed.");
+            return;
+        }
+
         synchronized (mService.mGlobalLock) {
             mDragState.reportDropWindowLock(token, x, y);
         }