From b791ead7027d4fa6dc8d74f03045273ee01f13f2 Mon Sep 17 00:00:00 2001
From: Henning Stahlke <flightgear@henningstahlke.de>
Date: Sun, 14 Feb 2021 13:01:18 +0100
Subject: [PATCH] Fix SVG parser crash on unsupported <defs> element.

---
 Nasal/canvas/svg.nas | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Nasal/canvas/svg.nas b/Nasal/canvas/svg.nas
index fb733594f..536e20b53 100644
--- a/Nasal/canvas/svg.nas
+++ b/Nasal/canvas/svg.nas
@@ -422,7 +422,7 @@ var parsesvg = func(group, path, options = nil)
       {
         append(defs_stack, {'type': name, 'id': attr['id']});
       }
-      else if( name == "rect" )
+      else if( ishash(defs_stack[-1]) and name == "rect" )
       {
         foreach(var p; ["x", "y", "width", "height"])
           defs_stack[-1][p] = evalCSSNum(attr[p]);