thx here:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1226438976 (LWP 25942)]
sanitize_path (str=0x0) at sj-extracting.c:654
654       while (*str == '.')
(gdb) thread apply all bt

Thread 2 (Thread -1235739728 (LWP 25945)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7237934 in poll () from /lib/tls/i686/cmov/libc.so.6
#2  0xb73e1658 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#3  0xb73e1b28 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#4  0xb748170e in link_thread_io_context () from /usr/lib/libORBit-2.so.0
#5  0xb73fa4a2 in g_static_private_free () from /usr/lib/libglib-2.0.so.0
#6  0xb72ad341 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb724155e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread -1226438976 (LWP 25942)):
#0  sanitize_path (str=0x0) at sj-extracting.c:654
#1  0x0805c507 in filepath_parse_pattern (pattern=0x835acf0 "%as/%at", track=0x83b85d8) at sj-extracting.c:748
#2  0x0805c7cd in pop_and_extract () at sj-extracting.c:120
#3  0xb74c5663 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#4  0xb74b8798 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#5  0xb74c8715 in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#6  0xb74ca238 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#7  0xb74ca589 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#8  0xb78a132f in gtk_button_clicked () from /usr/lib/libgtk-x11-2.0.so.0
#9  0xb78a2b6a in _gtk_button_set_depressed () from /usr/lib/libgtk-x11-2.0.so.0
#10 0xb74c5663 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#11 0xb74b8165 in g_cclosure_new_swap () from /usr/lib/libgobject-2.0.so.0
#12 0xb74b8798 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#13 0xb74c8a6c in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#14 0xb74ca238 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#15 0xb74ca589 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#16 0xb78a12ac in gtk_button_released () from /usr/lib/libgtk-x11-2.0.so.0
#17 0xb78a221c in _gtk_button_paint () from /usr/lib/libgtk-x11-2.0.so.0
#18 0xb79624b0 in _gtk_marshal_BOOLEAN__BOXED () from /usr/lib/libgtk-x11-2.0.so.0
#19 0xb74b8165 in g_cclosure_new_swap () from /usr/lib/libgobject-2.0.so.0
#20 0xb74b8798 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#21 0xb74c8e6e in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#22 0xb74c9f94 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#23 0xb74ca589 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#24 0xb7a445cf in gtk_widget_activate () from /usr/lib/libgtk-x11-2.0.so.0
#25 0xb7960c2d in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0
#26 0xb796103b in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#27 0xb7804c2c in _gdk_events_queue () from /usr/lib/libgdk-x11-2.0.so.0
#28 0xb73de747 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#29 0xb73e1806 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#30 0xb73e1b28 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#31 0xb7960335 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#32 0x080557a4 in main (argc=138118616, argv=0x83b85d8) at sj-main.c:1427
(gdb)