From df803cd34de6284835f751419dd9d2be471431df Mon Sep 17 00:00:00 2001
From: Stefan Nikolei <stefan@nikolei.eu>
Date: Wed, 1 Feb 2023 07:39:36 +0100
Subject: [PATCH] Fix nullref

the quantizier was initialized with default --> all properties are null. So we need to check that
---
 src/ImageSharp/Formats/Gif/GifEncoderCore.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ImageSharp/Formats/Gif/GifEncoderCore.cs b/src/ImageSharp/Formats/Gif/GifEncoderCore.cs
index 9cc045d45..eaa685293 100644
--- a/src/ImageSharp/Formats/Gif/GifEncoderCore.cs
+++ b/src/ImageSharp/Formats/Gif/GifEncoderCore.cs
@@ -171,7 +171,10 @@ internal sealed class GifEncoderCore : IImageEncoderInternals
             quantized = null;
         }
 
-        paletteQuantizer.Dispose();
+        if (hasPaletteQuantizer)
+        {
+            paletteQuantizer.Dispose();
+        }
     }
 
     private void EncodeFrame<TPixel>(