diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index a82ba4f734..3ff59900f0 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -3590,7 +3590,7 @@ void MixedFilamentConfigPanel::build_ui()
         if (m_mix_preview) {
             const std::string summary = summarize_sequence(preview_sequence);
             m_mix_preview->set_data(m_palette, preview_sequence, same_layer_mode, wxColour(m_mf.display_color),
-                                    _L("Preview"), summary.empty() ? wxEmptyString : from_u8(summary));
+                                    _L("Preview"), summary.empty() ? wxString() : from_u8(summary));
         }
         if (m_swatch) {
             m_swatch->SetBackgroundColour(wxColour(m_mf.display_color));
@@ -3788,7 +3788,7 @@ void MixedFilamentConfigPanel::update_preview()
     if (m_mix_preview) {
         const std::string summary = summarize_sequence(initial_sequence);
         m_mix_preview->set_data(m_palette, initial_sequence, same_layer_mode, wxColour(m_mf.display_color),
-                                _L("Preview"), summary.empty() ? wxEmptyString : from_u8(summary));
+                                _L("Preview"), summary.empty() ? wxString() : from_u8(summary));
     }
 }
 
diff --git a/src/slic3r/GUI/Selection.cpp b/src/slic3r/GUI/Selection.cpp
index c456dfa1a1..bd087d2d55 100644
--- a/src/slic3r/GUI/Selection.cpp
+++ b/src/slic3r/GUI/Selection.cpp
@@ -3158,7 +3158,7 @@ void Selection::paste_objects_from_clipboard()
         if (shift_all(0) != 0 || shift_all(1) != 0) {
             // BBS: if multiple objects are selected, move them as a whole after copy
             if (i == 0) empty_cell_all = wxGetApp().plater()->canvas3D()->get_nearest_empty_cell({start_point(0), start_point(1)}, {bbox.size()(0)+1,bbox.size()(1)+1});
-            auto instance_shift = src_object->instances.front()->get_offset() - src_objects[0]->instances.front()->get_offset();
+            Vec3d instance_shift = src_object->instances.front()->get_offset() - src_objects[0]->instances.front()->get_offset();
             displacement        = {shift_all.x() + empty_cell_all.x() + instance_shift.x(), shift_all.y() + empty_cell_all.y() + instance_shift.y(), start_offset(2)};
         } else {
             // BBS: if only one object is copied, find an empty cell to put it