From de73155c8412e4c36952809daaef8abbe9fd85ce Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Sat, 17 Mar 2018 07:47:55 -0400
Subject: [PATCH] https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6980

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

diff --git a/MagickCore/fx.c b/MagickCore/fx.c
index 0ac170667..f18fabd40 100644
--- a/MagickCore/fx.c
+++ b/MagickCore/fx.c
@@ -1329,7 +1329,8 @@ static double FxGetSymbol(FxInfo *fx_info,const PixelChannel channel,
               alpha=FxEvaluateSubexpression(fx_info,channel,x,y,subexpression,
                 &depth,&beta,exception);
               i=(ssize_t) alpha;
-              p++;
+              if (*p != '\0')
+                p++;
             }
           if (*p == '.')
             p++;
-- 
2.49.0