diff --git a/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp b/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp
index b33b0b2022..a8dc16c558 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp
@@ -259,9 +259,11 @@ void Raycaster::on_update()
     bool force_raycaster_regeneration = false;
     if (wxGetApp().preset_bundle->printers.get_selected_preset().printer_technology() == ptSLA) {
         // For sla printers we use the mesh generated by the backend
+        std::shared_ptr<const indexed_triangle_set> preview_mesh_ptr;
         const SLAPrintObject* po = get_pool()->selection_info()->print_object();
-        assert(po != nullptr);
-        std::shared_ptr<const indexed_triangle_set> preview_mesh_ptr = po->get_mesh_to_print();
+        if (po)
+            preview_mesh_ptr = po->get_mesh_to_print();
+
         if (preview_mesh_ptr)
             m_sla_mesh_cache = TriangleMesh{*preview_mesh_ptr};
 
@@ -323,12 +325,13 @@ void ObjectClipper::on_update()
     if (wxGetApp().preset_bundle->printers.get_selected_preset().printer_technology() == ptSLA) {
         // For sla printers we use the mesh generated by the backend
         const SLAPrintObject* po = get_pool()->selection_info()->print_object();
-        assert(po != nullptr);
-        auto partstoslice = po->get_parts_to_slice();
-        if (! partstoslice.empty()) {
-            mc = std::make_unique<MeshClipper>();
-            mc->set_mesh(range(partstoslice));
-            mc_tr = Geometry::Transformation{po->trafo().inverse().cast<double>()};
+        if (po) {
+            auto partstoslice = po->get_parts_to_slice();
+            if (! partstoslice.empty()) {
+                mc = std::make_unique<MeshClipper>();
+                mc->set_mesh(range(partstoslice));
+                mc_tr = Geometry::Transformation{po->trafo().inverse().cast<double>()};
+            }
         }
     }