Program received signal SIGSEGV, Segmentation fault.
0x00000000004cf7bc in Kart::updatePhysics (this=0x7fffbc124fd0,
    dt=<value optimized out>) at karts/kart.cpp:1400
1400	    if (isOnGround() && getMaterial()->getFriction()<10000.0f)
(gdb) bt
#0  0x00000000004cf7bc in Kart::updatePhysics (this=0x7fffbc124fd0,
    dt=<value optimized out>) at karts/kart.cpp:1400
#1  0x00000000004d0604 in Kart::update (this=0x7fffbc124fd0,
    dt=<value optimized out>) at karts/kart.cpp:742
#2  0x00000000004ea347 in World::update (this=0x7fffc7087ab0,
    dt=<value optimized out>) at modes/world.cpp:514
#3  0x00000000004e548e in LinearWorld::update (this=0x7fffbc1287b0, delta=1)
    at modes/linear_world.cpp:174
#4  0x00000000004e9f47 in World::updateWorld (this=0x7fffc7087ab0, dt=1)
    at modes/world.cpp:472
#5  0x00000000004121c1 in MainLoop::run (this=0x7fffe002c3e0)
    at main_loop.cpp:134
#6  0x0000000000410ba8 in main (argc=<value optimized out>,
    argv=0x7fffffffe2c8) at main.cpp:776