From 50acfc3e8d470526901784a1358534049c0bbf58 Mon Sep 17 00:00:00 2001
From: Mouad Debbar <mdebbar@google.com>
Date: Fri, 20 Sep 2019 10:15:04 -0700
Subject: [PATCH] Don't send pointer events when the framework isn't ready yet

---
 lib/web_ui/lib/src/engine/pointer_binding.dart | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/web_ui/lib/src/engine/pointer_binding.dart b/lib/web_ui/lib/src/engine/pointer_binding.dart
index 5a8cdf8cb4ff1..3d2c9e444cddb 100644
--- a/lib/web_ui/lib/src/engine/pointer_binding.dart
+++ b/lib/web_ui/lib/src/engine/pointer_binding.dart
@@ -82,7 +82,10 @@ class PointerBinding {
 
   void _onPointerData(List<ui.PointerData> data) {
     final ui.PointerDataPacket packet = ui.PointerDataPacket(data: data);
-    ui.window?.onPointerDataPacket(packet);
+    final ui.PointerDataPacketCallback callback = ui.window.onPointerDataPacket;
+    if (callback != null) {
+      callback(packet);
+    }
   }
 }