From c31906b0d15c010cbfdce660c814bdb36d05e7e1 Mon Sep 17 00:00:00 2001
From: enricoturri1966 <enricoturri@seznam.cz>
Date: Thu, 12 Oct 2023 13:30:58 +0200
Subject: [PATCH] SPE-1926: Fixed crash introduced with
 85e567788badabf7f9e89103a2333624814a5dd5

---
 src/slic3r/GUI/Selection.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/slic3r/GUI/Selection.cpp b/src/slic3r/GUI/Selection.cpp
index d659f5cd29..29102d64d3 100644
--- a/src/slic3r/GUI/Selection.cpp
+++ b/src/slic3r/GUI/Selection.cpp
@@ -928,9 +928,12 @@ const std::pair<Vec3d, double> Selection::get_bounding_sphere() const
         std::vector<Point> points;
         if (m_valid) {
             for (unsigned int i : m_list) {
-                const TriangleMesh* hull = (*m_volumes)[i]->convex_hull();
-                const Transform3d& matrix = (*m_volumes)[i]->world_matrix();
-                for (const Vec3f& v : hull->its.vertices) {
+                const GLVolume& volume = *(*m_volumes)[i];
+                const TriangleMesh* hull = volume.convex_hull();
+                const indexed_triangle_set& its = (hull != nullptr) ?
+                    hull->its : m_model->objects[volume.object_idx()]->volumes[volume.volume_idx()]->mesh().its;
+                const Transform3d& matrix = volume.world_matrix();
+                for (const Vec3f& v : its.vertices) {
                     const Vec3d vv = matrix * v.cast<double>();
                     points.push_back(Point(vv.x(), vv.y(), vv.z()));
                 }