diff --git a/src/libslic3r/Config.cpp b/src/libslic3r/Config.cpp
index a2756a9f8e..394cfb5b74 100644
--- a/src/libslic3r/Config.cpp
+++ b/src/libslic3r/Config.cpp
@@ -1049,7 +1049,8 @@ int ConfigBase::load_from_json(const std::string &file, ConfigSubstitutionContex
                 std::vector<std::string>& different_settings = this->option<ConfigOptionStrings>("different_settings_to_system", true)->values;
                 size_t size = different_settings.size();
                 if (size == 0) {
-                    size = this->option<ConfigOptionStrings>("filament_settings_id")->values.size() + 2;
+                    const auto *filament_ids = this->option<ConfigOptionStrings>("filament_settings_id");
+                    size = (filament_ids ? filament_ids->values.size() : 0) + 2;
                     different_settings.resize(size);
                 }