diff --git a/src/libslic3r/PresetBundle.cpp b/src/libslic3r/PresetBundle.cpp
index f14f1eb0a1..5e0ab15849 100644
--- a/src/libslic3r/PresetBundle.cpp
+++ b/src/libslic3r/PresetBundle.cpp
@@ -606,13 +606,24 @@ VendorType PresetBundle::get_current_vendor_type()
 {
     auto        t      = VendorType::Unknown;
     auto        config = &printers.get_edited_preset().config;
+    const auto* printer_model = config->opt<ConfigOptionString>("printer_model");
+    if (printer_model == nullptr) {
+        BOOST_LOG_TRIVIAL(warning) << __FUNCTION__ << ": printer_model is "
+                                   << (config->has("printer_model") ? "not a string" : "missing")
+                                   << ", vendor type is Unknown";
+        return t;
+    }
+
     std::string vendor_name;
-    for (auto vendor_profile : vendors) {
-        for (auto vendor_model : vendor_profile.second.models)
-            if (vendor_model.name == config->opt_string("printer_model")) {
+    for (const auto& vendor_profile : vendors) {
+        for (const auto& vendor_model : vendor_profile.second.models) {
+            if (vendor_model.name == printer_model->value) {
                 vendor_name = vendor_profile.first;
                 break;
             }
+        }
+        if (!vendor_name.empty())
+            break;
     }
     if (!vendor_name.empty())
     {
@@ -3779,7 +3790,17 @@ int PresetBundle::get_printer_extruder_count() const
 {
     const Preset& printer_preset = this->printers.get_edited_preset();
 
-    int count = printer_preset.config.option<ConfigOptionFloats>("nozzle_diameter")->values.size();
+    const auto* nozzle_diameter = printer_preset.config.option<ConfigOptionFloats>("nozzle_diameter");
+    if (nozzle_diameter == nullptr) {
+        BOOST_LOG_TRIVIAL(warning) << __FUNCTION__ << ": nozzle_diameter is missing, using 1 extruder";
+        return 1;
+    }
+    if (nozzle_diameter->values.empty()) {
+        BOOST_LOG_TRIVIAL(warning) << __FUNCTION__ << ": nozzle_diameter is empty, using 1 extruder";
+        return 1;
+    }
+
+    int count = int(nozzle_diameter->values.size());
 
     return count;
 }
diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index d9172510b6..6b30dfa9cd 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -5851,16 +5851,20 @@ void GUI_App::reload_settings()
             return;
         }
         BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << __LINE__ << " cloud user preset number is: " << user_presets.size();
-        // Check the user presets for any system vendors that need to be installed
-        for (auto data : user_presets) {
-            if (!check_preset_parent_available(data))
-                add_pending_vendor_preset(data);
-        }
-        load_pending_vendors();
-        preset_bundle->load_user_presets(*app_config, user_presets, ForwardCompatibilitySubstitutionRule::Enable);
-        preset_bundle->save_user_presets(*app_config, get_delete_cache_presets());
-        // Orca: settings changed, refresh ui to reflect the new preset values
-        auto refresh_synced_ui = [this] {
+        auto refresh_synced_ui = [this, user_presets = std::move(user_presets)]() mutable {
+            if (is_closing() || !preset_bundle || !app_config || !mainframe)
+                return;
+
+            // Check the user presets for any system vendors that need to be installed
+            for (auto data : user_presets) {
+                if (!check_preset_parent_available(data))
+                    add_pending_vendor_preset(data);
+            }
+            load_pending_vendors();
+            preset_bundle->load_user_presets(*app_config, user_presets, ForwardCompatibilitySubstitutionRule::Enable);
+            preset_bundle->save_user_presets(*app_config, get_delete_cache_presets());
+
+            // Orca: settings changed, refresh ui to reflect the new preset values
             mainframe->update_side_preset_ui();
             for (auto tab : tabs_list) {
                 tab->reload_config();
diff --git a/tests/libslic3r/test_preset_bundle_loading.cpp b/tests/libslic3r/test_preset_bundle_loading.cpp
index a00e8f9a63..e2bf930767 100644
--- a/tests/libslic3r/test_preset_bundle_loading.cpp
+++ b/tests/libslic3r/test_preset_bundle_loading.cpp
@@ -100,3 +100,33 @@ TEST_CASE("Legacy bundle import without bundle metadata stays in the user preset
     CHECK(fs::equivalent(fs::path(imported->file).parent_path().parent_path(), user_root / PRESET_PRINT_NAME));
 }
 
+TEST_CASE("Current vendor type tolerates missing printer model", "[Preset][Bundle]")
+{
+    PresetBundle bundle;
+
+    VendorProfile orca_vendor("ORCA");
+    VendorProfile::PrinterModel model;
+    model.name = "Orca Test";
+    orca_vendor.models.emplace_back(model);
+    bundle.vendors.emplace("ORCA", std::move(orca_vendor));
+
+    bundle.printers.get_edited_preset().config.erase("printer_model");
+
+    CHECK(bundle.get_current_vendor_type() == VendorType::Unknown);
+}
+
+TEST_CASE("Printer extruder count tolerates missing nozzle diameter", "[Preset][Bundle]")
+{
+    PresetBundle bundle;
+    DynamicPrintConfig& config = bundle.printers.get_edited_preset().config;
+
+    config.erase("nozzle_diameter");
+    CHECK(bundle.get_printer_extruder_count() == 1);
+
+    config.set_key_value("nozzle_diameter", new ConfigOptionFloats());
+    CHECK(bundle.get_printer_extruder_count() == 1);
+
+    config.set_key_value("nozzle_diameter", new ConfigOptionFloats({ 0.4, 0.6 }));
+    CHECK(bundle.get_printer_extruder_count() == 2);
+}
+