Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1216701968 (LWP 18726)]
0x081222da in game_events::entity_location::matches_unit ()
(gdb) bt
#0 0x081222da in game_events::entity_location::matches_unit ()
#1 0x08099153 in attack::attack ()
#2 0x081efb84 in events::mouse_handler::attack_enemy_ ()
#3 0x081f04f0 in events::mouse_handler::attack_enemy ()
#4 0x081f089a in events::mouse_handler::left_click ()
#5 0x081f15a3 in events::mouse_handler::mouse_press ()
#6 0x0826f2f1 in play_controller::handle_event ()
#7 0x083c1107 in events::pump ()
#8 0x0826eaf9 in play_controller::play_slice ()
#9 0x0827d0cb in playsingle_controller::play_human_turn ()
#10 0x0827c8ac in playsingle_controller::play_side ()
#11 0x0827d3e8 in playsingle_controller::play_turn ()
#12 0x0827f8a9 in playsingle_controller::play_scenario ()
#13 0x08260335 in playsingle_scenario ()
#14 0x08263026 in play_game ()
#15 0x080562f8 in (anonymous namespace)::game_controller::play_game ()
#16 0x0806a882 in play_game ()
#17 0x0806ad62 in main ()