From dc03398bc3edc5fdeca0a1d9cd200ad76c09d520 Mon Sep 17 00:00:00 2001
From: Chris Bracken <chris@bracken.jp>
Date: Mon, 12 Mar 2018 19:05:55 -0700
Subject: [PATCH] Avoid NPE in InkDecoration dispose (#15473)

Avoids a null pointer exception if dispose() is called on an
already-disposed InkDecoration.
---
 packages/flutter/lib/src/material/ink_decoration.dart | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/flutter/lib/src/material/ink_decoration.dart b/packages/flutter/lib/src/material/ink_decoration.dart
index 0392fc4482..8cb475e942 100644
--- a/packages/flutter/lib/src/material/ink_decoration.dart
+++ b/packages/flutter/lib/src/material/ink_decoration.dart
@@ -233,7 +233,7 @@ class _InkState extends State<Ink> {
 
   @override
   void deactivate() {
-    _ink.dispose();
+    _ink?.dispose();
     assert(_ink == null);
     super.deactivate();
   }