Comment 3 for bug 1242801

Confirmed with gtk-2.24.21, meld-1.8.2, pygtk 2.24.0 on ArchLinux.
Backtrace
#0 0x00007ffff41853d5 in gtk_tree_model_get_valist (
    tree_model=tree_model@entry=0x1502640, iter=iter@entry=0x7fffffffcb50,
    var_args=var_args@entry=0x7fffffffc9f8) at gtktreemodel.c:1470
#1 0x00007ffff41856ec in gtk_tree_model_get (tree_model=0x1502640,
    iter=0x7fffffffcb50) at gtktreemodel.c:1432
#2 0x00007ffff4054450 in combo_box_row_separator_func (model=<optimized out>,
    iter=<optimized out>, user_data=<optimized out>) at gtkfilechooserbutton.c:2365
#3 0x00007ffff402c7e4 in tree_column_row_is_sensitive (
    combo_box=combo_box@entry=0x14766b0, iter=iter@entry=0x7fffffffcb50)
    at gtkcombobox.c:1904
#4 0x00007ffff40323b2 in gtk_combo_box_list_button_released (
    widget=<optimized out>, event=0x7fffdc001b30, data=0x14766b0)
    at gtkcombobox.c:4160
#5 0x00007ffff40b1085 in _gtk_marshal_BOOLEAN__BOXED (closure=0x152bb40,
    return_value=0x7fffffffccc0, n_param_values=<optimized out>,
    param_values=0x7fffffffcd70, invocation_hint=<optimized out>, marshal_data=0x0)
    at gtkmarshalers.c:86
#6 0x00007ffff5207134 in g_closure_invoke (closure=0x152bb40,
    return_value=0x7fffffffccc0, n_param_values=2, param_values=0x7fffffffcd70,
    invocation_hint=0x7fffffffccf0) at gclosure.c:777
#7 0x00007ffff521c609 in signal_emit_unlocked_R (node=<optimized out>,
    detail=<optimized out>, instance=<optimized out>,
    emission_return=<optimized out>, instance_and_params=<optimized out>)
    at gsignal.c:3582
#8 0x00007ffff521d23b in g_signal_emit_valist (instance=0x155b2c0,
    signal_id=<optimized out>, detail=0, var_args=0x7fffffffcfa0) at gsignal.c:3336
#9 0x00007ffff521d98a in g_signal_emit (instance=0x7fffffffc970,
    instance@entry=0x155b2c0, signal_id=4294967295, detail=4152329808,
    detail@entry=0) at gsignal.c:3382
#10 0x00007ffff41c0c04 in gtk_widget_event_internal (widget=widget@entry=0x155b2c0,
    event=event@entry=0x7fffdc001b30) at gtkwidget.c:5010
#11 0x00007ffff41c0ed9 in gtk_widget_event (widget=widget@entry=0x155b2c0,
    event=event@entry=0x7fffdc001b30) at gtkwidget.c:4807
#12 0x00007ffff40af834 in gtk_propagate_event (widget=0x155b2c0,
    widget@entry=0x154b320, event=event@entry=0x7fffdc001b30) at gtkmain.c:2490
#13 0x00007ffff40afbeb in gtk_main_do_event (event=0x7fffdc001b30) at gtkmain.c:1685
#14 0x00007ffff3d1108c in gdk_event_dispatch (source=<optimized out>,
    callback=<optimized out>, user_data=<optimized out>) at gdkevents-x11.c:2403
#15 0x00007ffff513f278 in g_main_dispatch (context=<optimized out>) at gmain.c:3065
#16 g_main_context_dispatch (context=0xb159e0) at gmain.c:3641
#17 0x00007ffff513f61f in g_main_context_iterate (context=<optimized out>,
    block=<optimized out>, dispatch=<optimized out>, self=<optimized out>)
    at gmain.c:3712
#18 0x00007ffff513f8ff in g_main_loop_run (loop=loop@entry=0x1570990) at gmain.c:3906
#19 0x00007ffff40aecd7 in gtk_main () at gtkmain.c:1257
#20 0x00007ffff4763136 in ?? ()
   from /usr/lib/python2.7/site-packages/gtk-2.0/gtk/_gtk.so
#21 0x00007ffff7af95d6 in PyEval_EvalFrameEx () from /usr/lib/libpython2.7.so.1.0
#22 0x00007ffff7af9552 in PyEval_EvalFrameEx () from /usr/lib/libpython2.7.so.1.0
#23 0x00007ffff7afa290 in PyEval_EvalCodeEx () from /usr/lib/libpython2.7.so.1.0
#24 0x00007ffff7afa392 in PyEval_EvalCode () from /usr/lib/libpython2.7.so.1.0
#25 0x00007ffff7b1308f in run_mod () from /usr/lib/libpython2.7.so.1.0
#26 0x00007ffff7b141ae in PyRun_FileExFlags () from /usr/lib/libpython2.7.so.1.0
#27 0x00007ffff7b15319 in PyRun_SimpleFileExFlags ()
   from /usr/lib/libpython2.7.so.1.0
#28 0x00007ffff7b25c2f in Py_Main () from /usr/lib/libpython2.7.so.1.0
#29 0x00007ffff7474bc5 in __libc_start_main () from /usr/lib/libc.so.6
#30 0x0000000000400741 in _start ()