diff --git a/src/libslic3r/GCode/GCodeProcessor.cpp b/src/libslic3r/GCode/GCodeProcessor.cpp
index a0eec8817c..7adf5828bf 100644
--- a/src/libslic3r/GCode/GCodeProcessor.cpp
+++ b/src/libslic3r/GCode/GCodeProcessor.cpp
@@ -5436,6 +5436,16 @@ void GCodeProcessor::process_T(const std::string_view command)
 }
 
 
+void GCodeProcessor::init_filament_maps_and_nozzle_type_when_import_only_gcode()
+{
+    if (m_filament_maps.empty()) {
+        m_filament_maps.assign((int) EnforcerBlockerType::ExtruderMax, 1);
+    }
+    if (m_result.nozzle_type.empty()) {
+        m_result.nozzle_type.assign((int) EnforcerBlockerType::ExtruderMax, NozzleType::ntUndefine);
+    }
+}
+
 void GCodeProcessor::process_filament_change(int id)
 {
     assert(id < m_result.filaments_count);
@@ -5811,7 +5821,7 @@ void GCodeProcessor::update_slice_warnings()
     warning.params.clear();
     warning.level=1;
 
-    std::vector<int>nozzle_hrc_lists(m_result.nozzle_type.size(), 0);
+    std::vector<int> nozzle_hrc_lists(m_result.nozzle_type.size(), 0);
     // store the nozzle hrc of each extruder
     for (size_t idx = 0; idx < m_result.nozzle_type.size(); ++idx) {
         nozzle_hrc_lists[idx] = m_result.nozzle_hrc;
diff --git a/src/libslic3r/GCode/GCodeProcessor.hpp b/src/libslic3r/GCode/GCodeProcessor.hpp
index cca4c59433..23fa419494 100644
--- a/src/libslic3r/GCode/GCodeProcessor.hpp
+++ b/src/libslic3r/GCode/GCodeProcessor.hpp
@@ -838,7 +838,7 @@ class Print;
 
     public:
         GCodeProcessor();
-
+        void init_filament_maps_and_nozzle_type_when_import_only_gcode();
         // check whether the gcode path meets the filament_map grouping requirements
         bool check_multi_extruder_gcode_valid(const std::vector<Polygons> &unprintable_areas,
                                               const std::vector<double>   &printable_heights,
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 08437f6e0b..b1c906c1c5 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -12324,6 +12324,7 @@ void Plater::load_gcode(const wxString& filename)
 
     // process gcode
     GCodeProcessor processor;
+    processor.init_filament_maps_and_nozzle_type_when_import_only_gcode();
     try
     {
         GCodeProcessor::s_IsBBLPrinter = wxGetApp().preset_bundle->is_bbl_vendor();