panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x467a656]

goroutine 407 [running]:
github.com/go-spatial/tegola/atlas.Map.Encode.func1.1.1(0xc0002e1aa0, 0xc000c67e00, 0xc0070f7358)
	/Users/julio/lib/go/src/github.com/go-spatial/tegola/atlas/map.go:215 +0x505
panic(0x49c0580, 0x527c920)
	/usr/local/go/src/runtime/panic.go:679 +0x1b2
github.com/go-spatial/geom/planar/triangulate/quadedge.(*QuadEdge).Sym(...)
	/Users/julio/lib/go/src/github.com/go-spatial/geom/planar/triangulate/quadedge/quadedge.go:251
github.com/go-spatial/geom/planar/triangulate/constraineddelaunay.(*Triangulator).deleteEdge(0xc0070f6f58, 0xc0009644e0, 0x41716c4ca9fb7e18, 0x415ffcf349193de5)
	/Users/julio/lib/go/src/github.com/go-spatial/geom/planar/triangulate/constraineddelaunay/triangulator.go:162 +0xa6
github.com/go-spatial/geom/planar/triangulate/constraineddelaunay.(*Triangulator).insertEdgeCDT(0xc0070f6f58, 0xc0070f6a88, 0x0, 0x0, 0x0, 0x0)
	/Users/julio/lib/go/src/github.com/go-spatial/geom/planar/triangulate/constraineddelaunay/triangulator.go:757 +0x1678
github.com/go-spatial/geom/planar/triangulate/constraineddelaunay.(*Triangulator).insertConstraints(0xc0070f6f58, 0x49d6e80, 0xc0014c3320, 0x0, 0x0, 0x0, 0x42d7c700ad4cb1c5)
	/Users/julio/lib/go/src/github.com/go-spatial/geom/planar/triangulate/constraineddelaunay/triangulator.go:460 +0x5a8
github.com/go-spatial/geom/planar/triangulate/constraineddelaunay.(*Triangulator).InsertGeometries(0xc0070f6f58, 0xc0070f6f48, 0x1, 0x1, 0x0, 0x0, 0x0, 0xc0070f6ee0, 0x466d202)
	/Users/julio/lib/go/src/github.com/go-spatial/geom/planar/triangulate/constraineddelaunay/triangulator.go:373 +0x13b
github.com/go-spatial/geom/planar/makevalid.TriangulateGeometry(0x4c38980, 0xc0008cd350, 0x49d6e80, 0xc0014c3320, 0x54, 0x5c, 0x56, 0xc0070f7010, 0x409f999)
	/Users/julio/lib/go/src/github.com/go-spatial/geom/planar/makevalid/triangulate.go:19 +0xb3
github.com/go-spatial/geom/planar/makevalid.InsideTrianglesForGeometry(0x4c38980, 0xc0008cd350, 0x49d6e80, 0xc0014c3320, 0x4c31c00, 0xc00411fd20, 0x0, 0x0, 0x0, 0xc000099800, ...)
	/Users/julio/lib/go/src/github.com/go-spatial/geom/planar/makevalid/triangulate.go:57 +0x6a
github.com/go-spatial/geom/planar/makevalid.(*Makevalid).makevalidPolygon(0xc0070f7388, 0x4c38980, 0xc0008cd350, 0xc000798020, 0xc0014c3320, 0x1, 0x0, 0xc0070f7218)
	/Users/julio/lib/go/src/github.com/go-spatial/geom/planar/makevalid/makevalid.go:194 +0x11c
github.com/go-spatial/geom/planar/makevalid.(*Makevalid).Makevalid(0xc0070f7388, 0x4c38980, 0xc0008cd350, 0x49cd360, 0xc00683a2a0, 0xc000798020, 0x0, 0xc00683a2a0, 0x0, 0x0, ...)
	/Users/julio/lib/go/src/github.com/go-spatial/geom/planar/makevalid/makevalid.go:235 +0x57c
github.com/go-spatial/tegola/atlas.Map.Encode.func1.1(0xc0015a0000, 0x0, 0x0)
	/Users/julio/lib/go/src/github.com/go-spatial/tegola/atlas/map.go:254 +0x384
github.com/go-spatial/tegola/provider/postgis.Provider.TileFeatures(0xc0000d1570, 0x9, 0x1538, 0xc0000d15a0, 0xd, 0xc0000d15d0, 0x6, 0x0, 0x0, 0x0, ...)
	/Users/julio/lib/go/src/github.com/go-spatial/tegola/provider/postgis/postgis.go:601 +0xa41
github.com/go-spatial/tegola/atlas.Map.Encode.func1(0xc000cbe450, 0xc000c67e00, 0xc000255d90, 0x2, 0xc00027ede0, 0x10, 0x520d660, 0xc053119efffcb851, 0x404393a5a4fa85e7, 0x4014000000000000, ...)
	/Users/julio/lib/go/src/github.com/go-spatial/tegola/atlas/map.go:166 +0x272
created by github.com/go-spatial/tegola/atlas.Map.Encode
	/Users/julio/lib/go/src/github.com/go-spatial/tegola/atlas/map.go:154 +0x208