diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp index dcf115b93..c958cd18f 100644 --- a/src/slic3r/GUI/GLCanvas3D.cpp +++ b/src/slic3r/GUI/GLCanvas3D.cpp @@ -1388,8 +1388,9 @@ bool GLCanvas3D::Selection::is_single_full_instance() const int instance_idx = (*m_volumes)[*m_list.begin()]->instance_idx(); std::set<int> volumes_idxs; - for (const GLVolume* v : *m_volumes) + for (unsigned int i : m_list) { + const GLVolume* v = (*m_volumes)[i]; int volume_idx = v->volume_idx(); if ((v->object_idx() == object_idx) && (v->instance_idx() == instance_idx) && (volume_idx >= 0)) volumes_idxs.insert(volume_idx);