From 8e77892443601d702071dae4336d4976d9a7564f Mon Sep 17 00:00:00 2001
From: Karl Wright <DaddyWri@gmail.com>
Date: Wed, 11 Apr 2018 02:53:51 -0400
Subject: [PATCH] LUCENE-8245: Handle parallel planes case properly.

---
 .../org/apache/lucene/spatial3d/geom/GeoComplexPolygon.java    | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lucene/spatial3d/src/java/org/apache/lucene/spatial3d/geom/GeoComplexPolygon.java b/lucene/spatial3d/src/java/org/apache/lucene/spatial3d/geom/GeoComplexPolygon.java
index 3c635592946..5e362f294dc 100644
--- a/lucene/spatial3d/src/java/org/apache/lucene/spatial3d/geom/GeoComplexPolygon.java
+++ b/lucene/spatial3d/src/java/org/apache/lucene/spatial3d/geom/GeoComplexPolygon.java
@@ -603,6 +603,9 @@ class GeoComplexPolygon extends GeoBasePolygon {
     //System.out.println(" Computing crossings between "+envelopePlane+" and ["+edge.startPoint+"->"+edge.endPoint+"]");
     
     final GeoPoint[] unboundedIntersectionPoints = envelopePlane.findIntersections(planetModel, edge.plane);
+    if (unboundedIntersectionPoints == null) {
+      return null;
+    }
     // Go through the intersection points one at a time.  Notes:
     // (1) So that we don't double-count, we can only include at most one point in the result per intersection.
     // (2) Single-solution results imply that the plane was not crossed.  The only time we consider them is if the edge ends on the plane, in which case we count it as a crossing.