diff --git a/blcrack/cracker/cracker.cpp b/blcrack/cracker/cracker.cpp
index 8fb72edb8..07c2f154c 100644
--- a/blcrack/cracker/cracker.cpp
+++ b/blcrack/cracker/cracker.cpp
@@ -376,10 +376,12 @@ void Cracker::update_fake_player_info(const FakePlayerInfo& fake_info) {
 void Cracker::enable_remove_hard_mode_ship_type_limit() {
     m_state["Chapter"]["getConfig"] = [this](sol::this_state L, Lua::VariadicArgs args) -> Lua::Object {
         CALLED(Chapter.getConfig);
-        Lua::Object first_arg = args[1];
         bool limitation = false;
-        if (first_arg.get_type() == sol::type::string && first_arg.as<std::string>() == "limitation") {
-            limitation = true;
+        if (args.size() == 2) {
+            Lua::Object first_arg = args[1];
+            if (first_arg.get_type() == sol::type::string && first_arg.as<std::string>() == "limitation") {
+                limitation = true;
+            }
         }
 
         Lua::Object res = m_original.Chapter_getConfig(args);