diff --git a/src/slic3r/GUI/DeviceManager.cpp b/src/slic3r/GUI/DeviceManager.cpp
index 646f6c276..7cbee03e1 100644
--- a/src/slic3r/GUI/DeviceManager.cpp
+++ b/src/slic3r/GUI/DeviceManager.cpp
@@ -6108,6 +6108,7 @@ void MachineObject::update_printer_preset_name()
 {
     BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << " " << __LINE__ << "start update preset_name";
     PresetBundle *     preset_bundle = Slic3r::GUI::wxGetApp().preset_bundle;
+    if (!preset_bundle) return;
     auto               printer_model = MachineObject::get_preset_printer_model_name(this->printer_type);
     std::set<std::string> diameter_set;
     for (auto &nozzle : m_extder_data.extders) {
diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 8607e3e6d..857e5f70b 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -4949,7 +4949,7 @@ void GUI_App::process_network_msg(std::string dev_id, std::string msg)
         else if (msg == "cert_revoked") {
             BOOST_LOG_TRIVIAL(info) << "process_network_msg, cert_revoked";
             if (!m_show_error_msgdlg) {
-                MessageDialog msg_dlg(nullptr, _L("The certificate has been revoked. Please check the time settings or update Bambu Studio and try again."), "", wxAPPLY | wxOK);
+                MessageDialog msg_dlg(nullptr, _L("The certificate has been revoked and the printing functions are unavailable. If you need printing. Please visit the official website at https://bambulab.com/ to download and update."), "", wxAPPLY | wxOK);
                 m_show_error_msgdlg = true;
                 auto modal_result = msg_dlg.ShowModal();
                 m_show_error_msgdlg = false;
@@ -4958,7 +4958,7 @@ void GUI_App::process_network_msg(std::string dev_id, std::string msg)
         else if (msg == "update_firmware_studio") {
             BOOST_LOG_TRIVIAL(info) << "process_network_msg, firmware internal error";
             if (!m_show_error_msgdlg) {
-                MessageDialog msg_dlg(nullptr, _L("Firmware internal error, please try to upgrade firmware version."), "", wxAPPLY | wxOK);
+                MessageDialog msg_dlg(nullptr, _L("Internal error. Please try upgrading the firmware and Studio version. If the issue persists, contact customer support."), "", wxAPPLY | wxOK);
                 m_show_error_msgdlg = true;
                 auto modal_result = msg_dlg.ShowModal();
                 m_show_error_msgdlg = false;