SuperTux crashes when calling `restart()` from a trigger about supertux

[tobbi]

supertux2!SQVM::Execute(SQObjectPtr&, long long, long long, SQObjectPtr&, unsigned long long, SQVM::ExecutionType) (/Volumes/Development/workspace/supertux/external/squirrel/squirrel/sqvm.cpp:736)
supertux2!SQVM::Call(SQObjectPtr&, long long, long long, SQObjectPtr&, unsigned long long) (/Volumes/Development/workspace/supertux/external/squirrel/squirrel/sqvm.cpp:1600)
supertux2!::sq_call(HSQUIRRELVM, SQInteger, SQBool, SQBool) (/Volumes/Development/workspace/supertux/external/squirrel/squirrel/sqapi.cpp:1178)
supertux2!compile_and_run(SQVM*, std::__1::basic_istream<char, std::__1::char_traits<char> >&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (/Volumes/Development/workspace/supertux/src/squirrel/squirrel_util.cpp:239)
supertux2!SquirrelEnvironment::run_script(std::__1::basic_istream<char, std::__1::char_traits<char> >&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (/Volumes/Development/workspace/supertux/src/squirrel/squirrel_environment.cpp:167)
supertux2!SquirrelEnvironment::run_script(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (/Volumes/Development/workspace/supertux/src/squirrel/squirrel_environment.cpp:128)
supertux2!Base::Sector::run_script(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (/Volumes/Development/workspace/supertux/src/supertux/sector_base.cpp:34)
supertux2!ScriptTrigger::event(Player&, TriggerBase::EventType) (/Volumes/Development/workspace/supertux/src/trigger/scripttrigger.cpp:66)
supertux2!TriggerBase::collision(GameObject&, CollisionHit const&) (/Volumes/Development/workspace/supertux/src/trigger/trigger_base.cpp:63)
supertux2!Trigger::collision(GameObject&, CollisionHit const&) (/Volumes/Development/workspace/supertux/src/trigger/trigger_base.hpp:78)
supertux2!CollisionObject::collision(CollisionObject&, CollisionHit const&) (/Volumes/Development/workspace/supertux/src/collision/collision_object.cpp:51)
supertux2!CollisionSystem::update() (/Volumes/Development/workspace/supertux/src/collision/collision_system.cpp:612)
supertux2!Sector::update(float) (/Volumes/Development/workspace/supertux/src/supertux/sector.cpp:356)
supertux2!GameSession::update(float, Controller const&) (/Volumes/Development/workspace/supertux/src/supertux/game_session.cpp:501)
supertux2!ScreenManager::update_gamelogic(float) (/Volumes/Development/workspace/supertux/src/supertux/screen_manager.cpp:321)
supertux2!ScreenManager::loop_iter() (/Volumes/Development/workspace/supertux/src/supertux/screen_manager.cpp:634)
supertux2!ScreenManager::run() (/Volumes/Development/workspace/supertux/src/supertux/screen_manager.cpp:674)
supertux2!Main::launch_game(CommandLineArguments const&) (/Volumes/Development/workspace/supertux/src/supertux/main.cpp:658)
supertux2!Main::run(int, char**) (/Volumes/Development/workspace/supertux/src/supertux/main.cpp:744)
supertux2!main (/Volumes/Development/workspace/supertux/src/main.cpp:30)