[New Thread 0x7fff16ff5700 (LWP 10226)]

Thread 267 "ci" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fff23fff700 (LWP 10209)]
0x0000000000da2c04 in BC_ListBox::delete_columns (this=0x0) at bclistbox.C:1340
1340            if( column_titles ) {
(gdb) bt
#0  0x0000000000da2c04 in BC_ListBox::delete_columns (this=0x0) at bclistbox.C:1340
#1  0x0000000000da2d39 in BC_ListBox::set_columns (this=0x0, column_titles=0x0, column_width=0x0, 
    columns=1) at bclistbox.C:1362
#2  0x0000000000da2ee9 in BC_ListBox::update (this=0x0, data=0x7fff1c0043c0, column_titles=0x0, 
    column_widths=0x0, columns=1, xposition=0, yposition=0, highlighted_number=-1, recalc_positions=0, 
    draw=1) at bclistbox.C:1387
#3  0x0000000000d9df83 in BC_FileBox::update_history (this=0x7fff1c0008c0) at bcfilebox.C:1284
#4  0x00007fffe2e89c1f in BlendAlgebraFileButton::run (this=0x7fff4c01bba0) at blendalgebra.C:381
#5  0x0000000000e0e68e in Thread::entrypoint (parameters=0x7fff4c01d978) at thread.C:70
#6  0x00007ffff67286ba in start_thread (arg=0x7fff23fff700) at pthread_create.c:333
#7  0x00007ffff3afe4dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
(gdb) 
