From a71ce1913f6066b3cf9769f37cbea063c57c3e23 Mon Sep 17 00:00:00 2001
From: Dmitry Pentin <riotbr3aker@gmail.com>
Date: Fri, 14 May 2021 05:28:28 +0300
Subject: [PATCH] ImageFrameCollection.Contains first checks if it was disposed
 first

---
 src/ImageSharp/ImageFrameCollection{TPixel}.cs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/ImageSharp/ImageFrameCollection{TPixel}.cs b/src/ImageSharp/ImageFrameCollection{TPixel}.cs
index 023da0d347..92722494b1 100644
--- a/src/ImageSharp/ImageFrameCollection{TPixel}.cs
+++ b/src/ImageSharp/ImageFrameCollection{TPixel}.cs
@@ -208,8 +208,12 @@ namespace SixLabors.ImageSharp
         }
 
         /// <inheritdoc />
-        public override bool Contains(ImageFrame frame) =>
-            frame is ImageFrame<TPixel> specific && this.Contains(specific);
+        public override bool Contains(ImageFrame frame)
+        {
+            this.EnsureNotDisposed();
+
+            return frame is ImageFrame<TPixel> specific && this.frames.Contains(specific);
+        }
 
         /// <summary>
         /// Determines whether the <seealso cref="ImageFrameCollection{TPixel}"/> contains the <paramref name="frame"/>.