commit 7a4f99cd90d4520e9932e9de75439fc27ce64f36
author Cristy <urban-warrior@imagemagick.org> Sat Apr 28 17:34:11 2018 -0400
committer Cristy <urban-warrior@imagemagick.org> Sat Apr 28 17:34:11 2018 -0400
tree 4b6f4b23763b6f45bb18e6c63f869768066e7cd4
parent f55c97eaa68765747652c25634b559738fd76d1b

https://github.com/ImageMagick/ImageMagick/issues/1112

coders/json.c

diff --git a/coders/json.c b/coders/json.c
index d68aeaa..c7047ff 100644
--- a/coders/json.c
+++ b/coders/json.c
@@ -723,6 +723,7 @@
     GetMagickPrecision(),(double) ClampToQuantum(scale*
     channel_statistics[channel].maxima),GetMagickPrecision(),scale*
     channel_statistics[channel].mean,GetMagickPrecision(),scale*
+    IsNaN(channel_statistics[channel].standard_deviation) != 0 ? MagickEpsilon :
     channel_statistics[channel].standard_deviation,GetMagickPrecision(),
     channel_statistics[channel].kurtosis,GetMagickPrecision(),
     channel_statistics[channel].skewness,GetMagickPrecision(),