diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 11fff2fb3..a9fc1c63f 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -405,7 +405,7 @@ void PrintConfigDef::init_fff_params()
 
     def = this->add("bottom_fill_pattern", coEnum);
     *def = *def_top_fill_pattern;
-    def->label = L("Bottom Pattern");
+    def->label = L("Bottom fill pattern");
     def->tooltip = L("Fill pattern for bottom infill. This only affects the bottom external visible layer, and not its adjacent solid shells.");
     def->cli = "bottom-fill-pattern|external-fill-pattern|solid-fill-pattern";
     def->default_value = new ConfigOptionEnum<InfillPattern>(ipRectilinear);
diff --git a/src/libslic3r/SLA/SLASupportTree.cpp b/src/libslic3r/SLA/SLASupportTree.cpp
index 5f339fc96..9f2575036 100644
--- a/src/libslic3r/SLA/SLASupportTree.cpp
+++ b/src/libslic3r/SLA/SLASupportTree.cpp
@@ -1411,10 +1411,11 @@ public:
         using libnest2d::opt::GeneticOptimizer;
         using libnest2d::opt::StopCriteria;
 
-        for(unsigned i = 0, fidx = filtered_indices[0];
-            i < filtered_indices.size(); ++i, fidx = filtered_indices[i])
+        for(unsigned i = 0, fidx = 0; i < filtered_indices.size(); ++i)
         {
             m_thr();
+
+            fidx = filtered_indices[i];
             auto n = nmls.row(i);
 
             // for all normals we generate the spherical coordinates and
diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 57469a0c6..4757c95b9 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -655,9 +655,7 @@ void ObjectList::get_options_menu(settings_menu_hierarchy& settings_menu, const
         if (category.empty() ||
             (category == "Extruders" && extruders_cnt == 1)) continue;
 
-        const std::string& label = opt->label.empty() ? opt->full_label : 
-                                   opt->full_label.empty() ? opt->label :
-                                   opt->full_label + " " + opt->label;;
+        const std::string& label = !opt->full_label.empty() ? opt->full_label : opt->label;
         std::pair<std::string, std::string> option_label(option, label);
         std::vector< std::pair<std::string, std::string> > new_category;
         auto& cat_opt_label = settings_menu.find(category) == settings_menu.end() ? new_category : settings_menu.at(category);
@@ -1763,7 +1761,8 @@ void ObjectList::delete_from_model_and_list(const std::vector<ItemForDelete>& it
             if (item->type&itVolume)
             {
                 m_objects_model->Delete(m_objects_model->GetItemByVolumeId(item->obj_idx, item->sub_obj_idx));
-                if ((*m_objects)[item->obj_idx]->volumes.size() == 1)
+                if ((*m_objects)[item->obj_idx]->volumes.size() == 1 && 
+                    (*m_objects)[item->obj_idx]->config.has("extruder"))
                 {
                     const wxString extruder = wxString::Format("%d", (*m_objects)[item->obj_idx]->config.option<ConfigOptionInt>("extruder")->value);
                     m_objects_model->SetValue(extruder, m_objects_model->GetItemById(item->obj_idx), 1);
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index 56af8b4f9..6c7f246a6 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -816,6 +816,10 @@ void Tab::update_wiping_button_visibility() {
 // to update number of "filament" selection boxes when the number of extruders change.
 void Tab::on_presets_changed()
 {
+	if (wxGetApp().plater() == nullptr) {
+		return;
+	}
+
     // Instead of PostEvent (EVT_TAB_PRESETS_CHANGED) just call update_presets
     wxGetApp().plater()->sidebar().update_presets(m_type);
 	update_preset_description_line();