From bbcfa644d97e8ebea2648e93ab5974ccd1db53b1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Lehni?= <juerg@scratchdisk.com>
Date: Sat, 4 Feb 2017 20:50:22 +0100
Subject: [PATCH] Bring back accidentally removed winding object fallback.

---
 src/path/PathItem.Boolean.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/path/PathItem.Boolean.js b/src/path/PathItem.Boolean.js
index 3472678f..c8a470f9 100644
--- a/src/path/PathItem.Boolean.js
+++ b/src/path/PathItem.Boolean.js
@@ -774,7 +774,7 @@ PathItem.inject(new function() {
         function isValid(seg) {
             var winding;
             return !!(seg && !seg._visited && (!operator
-                    || operator[(winding = seg._winding).winding]
+                    || operator[(winding = seg._winding || {}).winding]
                         // Unite operations need special handling of segments
                         // with a winding contribution of two (part of both
                         // areas), which are only valid if they are part of the