diff --git a/src/slic3r/GUI/AMSMaterialsSetting.cpp b/src/slic3r/GUI/AMSMaterialsSetting.cpp
index ed62f0c4e..8a6a8f737 100644
--- a/src/slic3r/GUI/AMSMaterialsSetting.cpp
+++ b/src/slic3r/GUI/AMSMaterialsSetting.cpp
@@ -484,6 +484,7 @@ void AMSMaterialsSetting::on_select_reset(wxCommandEvent& event) {
     wxColour color = *wxWHITE;
     char col_buf[10];
     sprintf(col_buf, "%02X%02X%02X00", (int)color.Red(), (int)color.Green(), (int)color.Blue());
+    std::string color_str;  // reset use empty string
 
     std::string   selected_ams_id;
     PresetBundle *preset_bundle = wxGetApp().preset_bundle;
@@ -509,14 +510,14 @@ void AMSMaterialsSetting::on_select_reset(wxCommandEvent& event) {
             else {
                 tar_tray = 0;
             }
-            obj->command_ams_filament_settings(ams_id, tar_tray, ams_filament_id, ams_setting_id, std::string(col_buf), m_filament_type, nozzle_temp_min_int, nozzle_temp_max_int);
+            obj->command_ams_filament_settings(ams_id, tar_tray, ams_filament_id, ams_setting_id, color_str, m_filament_type, nozzle_temp_min_int, nozzle_temp_max_int);
         }
         else if(m_is_third){
             if (obj->is_enable_np) {
-                obj->command_ams_filament_settings(ams_id, slot_id, ams_filament_id, ams_setting_id, std::string(col_buf), m_filament_type, nozzle_temp_min_int, nozzle_temp_max_int);
+                obj->command_ams_filament_settings(ams_id, slot_id, ams_filament_id, ams_setting_id, color_str, m_filament_type, nozzle_temp_min_int, nozzle_temp_max_int);
             }
             else {
-                obj->command_ams_filament_settings(ams_id, slot_id, ams_filament_id, ams_setting_id, std::string(col_buf), m_filament_type, nozzle_temp_min_int, nozzle_temp_max_int);
+                obj->command_ams_filament_settings(ams_id, slot_id, ams_filament_id, ams_setting_id, color_str, m_filament_type, nozzle_temp_min_int, nozzle_temp_max_int);
             }
         }