From 351bde38f38dbb18bbc439e2bb8a9c3348c43aa6 Mon Sep 17 00:00:00 2001
From: NaBian <836904362@qq.com>
Date: Fri, 25 Sep 2020 23:19:53 +0800
Subject: [PATCH] fixed #481

---
 src/Shared/HandyControl_Shared/Controls/Image/ImageViewer.cs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Shared/HandyControl_Shared/Controls/Image/ImageViewer.cs b/src/Shared/HandyControl_Shared/Controls/Image/ImageViewer.cs
index abee79dd..dedf47c0 100644
--- a/src/Shared/HandyControl_Shared/Controls/Image/ImageViewer.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Image/ImageViewer.cs
@@ -512,6 +512,8 @@ namespace HandyControl.Controls
 
         private void Dispatcher_Tick(object sender, EventArgs e)
         {
+            if (_dispatcher == null) return;
+
             if (ImageSource == null || !IsLoaded)
             {
                 _dispatcher.Stop();