From 702655b90f3e55237e8da893f6cbd4966e70f9fa Mon Sep 17 00:00:00 2001
From: mob-sakai <sakai861104@gmail.com>
Date: Sun, 30 Dec 2018 10:47:30 +0900
Subject: [PATCH] fix #23; An error occur when SoftMask is destroyed on editor

---
 .../Coffee/UIExtensions/SoftMaskForUGUI/Scripts/SoftMask.cs  | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/SoftMask.cs b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/SoftMask.cs
index 94ed6d3..3d44849 100644
--- a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/SoftMask.cs
+++ b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/SoftMask.cs
@@ -413,6 +413,11 @@ namespace Coffee.UIExtensions
 		/// </summary>
 		void UpdateMaskTexture()
 		{
+			if(!graphic || !graphic.canvas)
+			{
+				return;
+			}
+
 			Transform stopAfter = MaskUtilities.FindRootSortOverrideCanvas(transform);
 			_stencilDepth = MaskUtilities.GetStencilDepth(transform, stopAfter);