From ae322aad90cefa78b26fd6f10b8f743b3190d141 Mon Sep 17 00:00:00 2001
From: Koza <kiskoza@gmail.com>
Date: Thu, 19 Oct 2023 15:56:06 +0200
Subject: Fix frozen string error for scatter series with non-default marker

---
 lib/axlsx/drawing/scatter_series.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib/axlsx')

diff --git a/lib/axlsx/drawing/scatter_series.rb b/lib/axlsx/drawing/scatter_series.rb
index 865c6f85..ffff81f5 100644
--- a/lib/axlsx/drawing/scatter_series.rb
+++ b/lib/axlsx/drawing/scatter_series.rb
@@ -121,7 +121,7 @@ module Axlsx
       if !@show_marker
         '<c:symbol val="none"/>'
       elsif @marker_symbol != :default
-        '<c:symbol val="' << @marker_symbol.to_s << '"/>'
+        +'<c:symbol val="' << @marker_symbol.to_s << '"/>'
       end.to_s
     end
   end
-- 
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