diff --git a/src/libslic3r/Model.cpp b/src/libslic3r/Model.cpp
index 77e0a405d..cd12c327a 100644
--- a/src/libslic3r/Model.cpp
+++ b/src/libslic3r/Model.cpp
@@ -3772,7 +3772,9 @@ bool Model::obj_import_face_color_deal(const std::vector<unsigned char> &face_fi
             for (size_t i = 0; i < volume->mesh().its.indices.size(); i++) {
                 auto face         = volume->mesh().its.indices[i];
                 auto filament_id = face_filament_ids[i];
-                if (filament_id <= 1) { continue; }
+                if (filament_id < 1) {
+                    continue;
+                }
                 std::string result;
                 get_real_filament_id(filament_id, result);
                 volume->mmu_segmentation_facets.set_triangle_from_string(i, result);
diff --git a/src/slic3r/GUI/ObjColorDialog.cpp b/src/slic3r/GUI/ObjColorDialog.cpp
index 34eddba7b..946abd52f 100644
--- a/src/slic3r/GUI/ObjColorDialog.cpp
+++ b/src/slic3r/GUI/ObjColorDialog.cpp
@@ -515,7 +515,11 @@ void ObjColorPanel::update_filament_ids()
    m_filament_ids.reserve(m_input_colors_size);
    for (size_t i = 0; i < m_input_colors_size; i++) {
        auto label = m_cluster_labels_from_algo[i];
-       m_filament_ids.emplace_back(m_cluster_map_filaments[label]);
+       if (m_cluster_map_filaments[label] > 0) { 
+           m_filament_ids.emplace_back(m_cluster_map_filaments[label]);
+       } else {
+           m_filament_ids.emplace_back(1);//min filament_id is 1
+       }
    }
    m_first_extruder_id = m_cluster_map_filaments[0];
 }
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 329f3aaa1..a6c16b620 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -12107,7 +12107,7 @@ void Plater::update_obj_preview_thumbnail(ModelObject *mo, int obj_idx, int vol_
     ModelObjectPtrs model_objects;
     model_objects.emplace_back(mo);
     get_view3D_canvas3D()->render_thumbnail(plate->obj_preview_thumbnail_data, colors, plate->plate_thumbnail_width, plate->plate_thumbnail_height, thumbnail_params,
-                                            model_objects, cur_volumes, Camera::EType::Ortho, (Camera::ViewAngleType) camera_view_angle_type, false, true);
+                                            model_objects, cur_volumes, Camera::EType::Ortho, (Camera::ViewAngleType) camera_view_angle_type, false, false);
 }
 
 //invalid all plate's thumbnails