https://github.com/ImageMagick/ImageMagick6/issues/13

diff --git a/MagickWand/magick-wand.c b/MagickWand/magick-wand.c
index 4d383c31f0656074235feaa17eb8072494caf159..8f64581beb73be1976051997b4526f746f74fcda 100644 (file)
--- a/MagickWand/magick-wand.c
+++ b/MagickWand/magick-wand.c
@@ -416,7 +416,9 @@ WandExport char *MagickQueryConfigureOption(const char *option)
   exception=DestroyExceptionInfo(exception);
   if (configure_info == (const ConfigureInfo **) NULL)
     return((char *) NULL);
-  value=AcquireString(configure_info[0]->value);
+  value=(char *) NULL;
+  if (number_options > 0)
+    value=AcquireString(configure_info[0]->value);
   configure_info=(const ConfigureInfo **)
     RelinquishMagickMemory((void *) configure_info);
   return(value);