From 4966886b70e6928842f59cc5c787806b85959ca0 Mon Sep 17 00:00:00 2001
From: Ellpeck <me@ellpeck.de>
Date: Sat, 30 Oct 2021 15:35:46 +0200
Subject: [PATCH] fixed a ui demo crash when leaving while the wobble button is
 wobbling

---
 Demos/UiDemo.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Demos/UiDemo.cs b/Demos/UiDemo.cs
index 45feeb0..31908ff 100644
--- a/Demos/UiDemo.cs
+++ b/Demos/UiDemo.cs
@@ -241,7 +241,7 @@ namespace Demos {
         // Note that this particular example makes use of the Coroutine package, which is not required but makes demonstration easier
         private static IEnumerator<Wait> WobbleButton(Element button) {
             var counter = 0F;
-            while (counter < 4 * Math.PI) {
+            while (counter < 4 * Math.PI && button.Root != null) {
                 // Every element allows the implementation of any sort of custom rendering for itself and all of its child components
                 // This includes simply changing the transform matrix like here, but also applying custom effects and doing
                 // anything else that can be done in the SpriteBatch's Begin call.