From f7fc44712287e76b7fe9b22b61966b26ed70f997 Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Sun, 11 Aug 2019 09:26:59 -0400
Subject: [PATCH] ...

---
 MagickCore/cache.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/MagickCore/cache.c b/MagickCore/cache.c
index 2842b1c73..bf4687965 100644
--- a/MagickCore/cache.c
+++ b/MagickCore/cache.c
@@ -1750,7 +1750,8 @@ static Cache GetImagePixelCache(Image *image,const MagickBooleanType clone,
       /*
         Ensure the image matches the pixel cache morphology.
       */
-      image->type=UndefinedType;
+      if (image->type != UndefinedType)
+        image->type=UndefinedType;
       if (ValidatePixelCacheMorphology(image) == MagickFalse)
         {
           status=OpenPixelCache(image,IOMode,exception);
-- 
2.40.0