From 20dfa4ceaa647035b0b842e2baf1c18667fbc50b Mon Sep 17 00:00:00 2001
From: Haoyu Qiu <timothyqiu32@gmail.com>
Date: Fri, 21 May 2021 17:12:13 +0800
Subject: [PATCH] Fix STL to Godot type convertion of polypartition

(cherry picked from commit d16bef8b55e6c978da44ea3c4b0822340e15027c)
---
 thirdparty/misc/triangulator.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/thirdparty/misc/triangulator.cpp b/thirdparty/misc/triangulator.cpp
index 75b2b064c4..6710f59240 100644
--- a/thirdparty/misc/triangulator.cpp
+++ b/thirdparty/misc/triangulator.cpp
@@ -1166,7 +1166,7 @@ int TriangulatorPartition::MonotonePartition(List<TriangulatorPoly> *inpolys, Li
 				newedge.p1 = v->p;
 				newedge.p2 = v->p;
 				edgeIter = edgeTree.lower_bound(newedge);
-				if(edgeIter == edgeTree.front()) {
+				if(edgeIter == nullptr || edgeIter == edgeTree.front()) {
 					error = true;
 					break;
 				}
@@ -1202,7 +1202,7 @@ int TriangulatorPartition::MonotonePartition(List<TriangulatorPoly> *inpolys, Li
 				newedge.p1 = v->p;
 				newedge.p2 = v->p;
 				edgeIter = edgeTree.lower_bound(newedge);
-				if(edgeIter == edgeTree.front()) {
+				if(edgeIter == nullptr || edgeIter == edgeTree.front()) {
 					error = true;
 					break;
 				}
@@ -1241,7 +1241,7 @@ int TriangulatorPartition::MonotonePartition(List<TriangulatorPoly> *inpolys, Li
 					newedge.p1 = v->p;
 					newedge.p2 = v->p;
 					edgeIter = edgeTree.lower_bound(newedge);
-					if(edgeIter == edgeTree.front()) {
+					if(edgeIter == nullptr || edgeIter == edgeTree.front()) {
 						error = true;
 						break;
 					}