From eb8cf74074bf6e4228970432c583ea12016d07cc Mon Sep 17 00:00:00 2001
From: Pawel Lampe <pawel.lampe@gmail.com>
Date: Sun, 3 Apr 2022 21:47:20 +0200
Subject: [PATCH] Fix debug navmesh errors, fixes #59845

---
 scene/resources/navigation_mesh.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scene/resources/navigation_mesh.cpp b/scene/resources/navigation_mesh.cpp
index eea4227d5..f304c11eb 100644
--- a/scene/resources/navigation_mesh.cpp
+++ b/scene/resources/navigation_mesh.cpp
@@ -381,6 +381,10 @@ Ref<Mesh> NavigationMesh::get_debug_mesh() {
 
 	debug_mesh = Ref<ArrayMesh>(memnew(ArrayMesh));
 
+	if (lines.empty()) {
+		return debug_mesh;
+	}
+
 	Array arr;
 	arr.resize(Mesh::ARRAY_MAX);
 	arr[Mesh::ARRAY_VERTEX] = varr;