Thread 1 "abuse" received signal SIGSEGV, Segmentation fault.
LObject::Eval (this=0x0) at lisp.cpp:3085
3085	        switch (item_type(this))
(gdb) bt
#0  LObject::Eval (this=0x0) at lisp.cpp:3085
#1  0x00000000004535a2 in LSysFunction::EvalFunction (this=0x6075a8, 
    arg_list=<optimized out>) at lisp.cpp:1927
#2  0x0000000000456d92 in LSymbol::EvalFunction (this=0x5f9470, 
    arg_list=<optimized out>) at lisp.cpp:1461
#3  0x0000000000457245 in LObject::Eval (this=0x609158) at lisp.cpp:3109
#4  0x00000000004560af in LSysFunction::EvalFunction (this=<optimized out>, 
    arg_list=<optimized out>) at lisp.cpp:2405
#5  0x0000000000456d92 in LSymbol::EvalFunction (this=0x5f9530, 
    arg_list=<optimized out>) at lisp.cpp:1461
#6  0x0000000000457245 in LObject::Eval (this=0x5f78e0) at lisp.cpp:3109
#7  0x0000000000441291 in load_data (argc=argc@entry=1, 
    argv=argv@entry=0x7fffffffd598) at loader2.cpp:357
#8  0x000000000044cbb9 in Game::Game (this=0x5ff520, argc=1, 
    argv=0x7fffffffd598) at game.cpp:1381
#9  0x0000000000407332 in main (argc=1, argv=0x7fffffffd598) at game.cpp:2464