https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31262

diff --git a/MagickCore/image.c b/MagickCore/image.c
index 6cf47ce13eb72eceb820212d2ddea461596b0181..1b1bdc15b87e8b944881c41dffcdf347d4e67c75 100644 (file)
--- a/MagickCore/image.c
+++ b/MagickCore/image.c
@@ -3678,6 +3678,8 @@ MagickExport MagickBooleanType SyncImage(Image *image,ExceptionInfo *exception)
   if (image->debug != MagickFalse)
     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
   assert(image->signature == MagickCoreSignature);
+  if (image->ping != MagickFalse)
+    return(MagickTrue);
   if (image->storage_class != PseudoClass)
     return(MagickFalse);
   assert(image->colormap != (PixelInfo *) NULL);