https://github.com/ImageMagick/ImageMagick/issues/706

diff --git a/MagickCore/identify.c b/MagickCore/identify.c
index 2765e7fbd28109cb386b295ad7fee324655e854a..623e8a8fa1d20400d487bd62d3075019bed502c4 100644 (file)
--- a/MagickCore/identify.c
+++ b/MagickCore/identify.c
@@ -1041,7 +1041,8 @@ MagickExport MagickBooleanType IdentifyImage(Image *image,FILE *file,
                 pixel;
 
               GetPixelInfo(image,&pixel);
-              GetPixelInfoPixel(image,p,&pixel);
+              if (p != (const Quantum *) NULL)
+                GetPixelInfoPixel(image,p,&pixel);
               (void) QueryColorname(image,&pixel,SVGCompliance,tuple,
                 exception);
               (void) FormatLocaleFile(file,"  Alpha: %s ",tuple);