From 0fa9bcc63b6daee4c58d73bb726e3311c78ea66b Mon Sep 17 00:00:00 2001
From: tamasmeszaros <meszaros.q@gmail.com>
Date: Mon, 16 Jan 2023 19:47:35 +0100
Subject: [PATCH] Fix crash with fff mmu

---
 src/slic3r/GUI/GLCanvas3D.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 6b8499dde..291cc57ec 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -7100,9 +7100,12 @@ const ModelVolume *get_model_volume(const GLVolume &v, const Model &model)
     const ModelVolume * ret = nullptr;
 
     if (model.objects.size() < v.object_idx()) {
-        const ModelObject *obj = model.objects[v.object_idx()];
-        if (obj->volumes.size() < v.volume_idx())
-            ret = obj->volumes[v.volume_idx()];
+        if (v.object_idx() < model.objects.size()) {
+            const ModelObject *obj = model.objects[v.object_idx()];
+            if (v.volume_idx() < obj->volumes.size()) {
+                ret = obj->volumes[v.volume_idx()];
+            }
+        }
     }
 
     return ret;