From 40d59fec0ba02a069963c61bd9b36f0b4768815b Mon Sep 17 00:00:00 2001
From: wp <wp.no-reply@lazarus-ide-org>
Date: Thu, 17 Oct 2019 22:00:28 +0000
Subject: [PATCH] TAChart: Fix chart distance tools crashing when series
 contains a NaN value.

git-svn-id: trunk@62069 -
---
 components/tachart/tacustomseries.pas | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/components/tachart/tacustomseries.pas b/components/tachart/tacustomseries.pas
index bc3d06e563..ce68ab8052 100644
--- a/components/tachart/tacustomseries.pas
+++ b/components/tachart/tacustomseries.pas
@@ -1861,7 +1861,10 @@ var
 begin
   Unused(APointIdx);
   Unused(AXIdx, AYIdx);
-  pt := ParentChart.GraphToImage(AGraphPt);
+  if IsNaN(AGraphPt) then
+    pt := Point(10000, 10000)
+  else
+    pt := ParentChart.GraphToImage(AGraphPt);
   Result := AParams.FDistFunc(AParams.FPoint, pt);
 end;