From 69df0271b5e9c5be8ff0d16fe6e24f1e7ed8e6fc Mon Sep 17 00:00:00 2001
From: Lex Neva <github.com@lexneva.name>
Date: Wed, 20 Mar 2019 20:35:54 -0400
Subject: [PATCH] protect against shapely error

---
 lib/stitches/auto_fill.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/stitches/auto_fill.py b/lib/stitches/auto_fill.py
index b85d335e5..8435d156c 100644
--- a/lib/stitches/auto_fill.py
+++ b/lib/stitches/auto_fill.py
@@ -268,6 +268,11 @@ def build_travel_graph(fill_stitch_graph, shape, fill_stitch_angle, underpath):
 
             graph.add_edge(*edge, weight=p1.distance(p2))
 
+        # otherwise we sometimes get exceptions like this:
+        # Exception AttributeError: "'NoneType' object has no attribute 'GEOSSTRtree_destroy'" in
+        #   <bound method STRtree.__del__ of <shapely.strtree.STRtree instance at 0x0D2BFD50>> ignored
+        del rtree
+
     return graph