I can repeat it at will: Open Memos, click on "click here to add a memo", type something, and tab/tab. SIGSEGV.  Will look upstream.

BT:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff252dfa0 in pvl_head () from /usr/lib/libical.so.0
(gdb) bt
#0  0x00007ffff252dfa0 in pvl_head () from /usr/lib/libical.so.0
#1  0x00007ffff251bedc in icalcomponent_free () from /usr/lib/libical.so.0
#2  0x00007fffe20a2850 in e_cal_model_component_finalize (object=0xc92520) at e-cal-model.c:2473
#3  0x00007fffec45f52f in IA__g_object_unref (_object=<value optimized out>)
    at /build/buildd/glib2.0-2.22.2/gobject/gobject.c:2472
#4  0x00007fffe20a6975 in ecm_append_row (etm=0x7fffd41064d0, source=0xc6a190, row=0) at e-cal-model.c:922
#5  0x00007ffff6435226 in finish_editing (etcta=0xb11ee0) at e-table-click-to-add.c:344
#6  0x00007ffff643555d in etcta_event (item=0xb11ee0, e=0xc6f420) at e-table-click-to-add.c:429
#7  0x00007ffff066a3e8 in gnome_canvas_marshal_BOOLEAN__BOXED () from /usr/lib/libgnomecanvas-2.so.0
#8  0x00007fffec45d5ae in IA__g_closure_invoke (closure=0xb2d3b0, return_value=0x7fffffffd110, 
    n_param_values=2, param_values=0xca1a70, invocation_hint=0x7fffffffd0d0)
    at /build/buildd/glib2.0-2.22.2/gobject/gclosure.c:767
#9  0x00007fffec47264d in signal_emit_unlocked_R (node=0xb30a00, detail=<value optimized out>, 
    instance=<value optimized out>, emission_return=<value optimized out>, 
    instance_and_params=<value optimized out>) at /build/buildd/glib2.0-2.22.2/gobject/gsignal.c:3285
#10 0x00007fffec473bcc in IA__g_signal_emit_valist (instance=0xb11ee0, signal_id=<value optimized out>, 
    detail=0, var_args=0x7fffffffd2d0) at /build/buildd/glib2.0-2.22.2/gobject/gsignal.c:2990
#11 0x00007fffec4740a4 in IA__g_signal_emit_by_name (instance=0xb11ee0, detailed_signal=0x7ffff77ac094 "event")
    at /build/buildd/glib2.0-2.22.2/gobject/gsignal.c:3074
#12 0x00007ffff779c4f7 in emit_event (canvas=<value optimized out>, event=<value optimized out>)
    at e-canvas.c:250
#13 0x00007ffff779c8f4 in e_canvas_key (widget=0x7da620, event=0x6edc40) at e-canvas.c:278
#14 0x00007fffee805728 in _gtk_marshal_BOOLEAN__BOXED (closure=0x689070, return_value=0x7fffffffd670, 
    n_param_values=<value optimized out>, param_values=0x9a16f0, invocation_hint=<value optimized out>, 
    marshal_data=0x7ffff779c810) at /build/buildd/gtk+2.0-2.18.3/gtk/gtkmarshalers.c:84
#15 0x00007fffec45d4f9 in IA__g_closure_invoke (closure=0x689070, return_value=0x7fffffffd670, 
    n_param_values=2, param_values=0x9a16f0, invocation_hint=0x7fffffffd630)
    at /build/buildd/glib2.0-2.22.2/gobject/gclosure.c:767
#16 0x00007fffec47264d in signal_emit_unlocked_R (node=0x6890e0, detail=<value optimized out>, 
    instance=<value optimized out>, emission_return=<value optimized out>, 
    instance_and_params=<value optimized out>) at /build/buildd/glib2.0-2.22.2/gobject/gsignal.c:3285
#17 0x00007fffec473bcc in IA__g_signal_emit_valist (instance=0x7da620, signal_id=<value optimized out>, 
    detail=0, var_args=0x7fffffffd820) at /build/buildd/glib2.0-2.22.2/gobject/gsignal.c:2990
#18 0x00007fffec474283 in IA__g_signal_emit (instance=0x0, signal_id=8, detail=9273808)
    at /build/buildd/glib2.0-2.22.2/gobject/gsignal.c:3037
#19 0x00007fffee90c72f in gtk_widget_event_internal (widget=0x7da620, event=0x6edc40)
    at /build/buildd/gtk+2.0-2.18.3/gtk/gtkwidget.c:4767
#20 0x00007fffee91f1cb in IA__gtk_window_propagate_key_event (window=0x92e000, event=0x6edc40)
    at /build/buildd/gtk+2.0-2.18.3/gtk/gtkwindow.c:5144
#21 0x00007fffee9221cb in gtk_window_key_press_event (widget=0x92e000, event=0x6edc40)
    at /build/buildd/gtk+2.0-2.18.3/gtk/gtkwindow.c:5174
#22 0x00007ffff0acf32c in bonobo_window_key_press_event (widget=0x92e000, event=0x6edc40)
    at bonobo-window.c:268
#23 0x00007fffee805728 in _gtk_marshal_BOOLEAN__BOXED (closure=0x689070, return_value=0x7fffffffdb50, 
    n_param_values=<value optimized out>, param_values=0xc3a8f0, invocation_hint=<value optimized out>, 
    marshal_data=0x7ffff0acf300) at /build/buildd/gtk+2.0-2.18.3/gtk/gtkmarshalers.c:84
#24 0x00007fffec45d5ae in IA__g_closure_invoke (closure=0x689070, return_value=0x7fffffffdb50, 
    n_param_values=2, param_values=0xc3a8f0, invocation_hint=0x7fffffffdb10)
    at /build/buildd/glib2.0-2.22.2/gobject/gclosure.c:767
#25 0x00007fffec47264d in signal_emit_unlocked_R (node=0x6890e0, detail=<value optimized out>, 
    instance=<value optimized out>, emission_return=<value optimized out>, 
    instance_and_params=<value optimized out>) at /build/buildd/glib2.0-2.22.2/gobject/gsignal.c:3285
#26 0x00007fffec473bcc in IA__g_signal_emit_valist (instance=0x92e000, signal_id=<value optimized out>, 
    detail=0, var_args=0x7fffffffdd00) at /build/buildd/glib2.0-2.22.2/gobject/gsignal.c:2990
#27 0x00007fffec474283 in IA__g_signal_emit (instance=0x0, signal_id=8, detail=9273808)
    at /build/buildd/glib2.0-2.22.2/gobject/gsignal.c:3037
#28 0x00007fffee90c72f in gtk_widget_event_internal (widget=0x92e000, event=0x6edc40)
    at /build/buildd/gtk+2.0-2.18.3/gtk/gtkwidget.c:4767
#29 0x00007fffee7fdda4 in IA__gtk_propagate_event (widget=0x92e000, event=0x6edc40)
    at /build/buildd/gtk+2.0-2.18.3/gtk/gtkmain.c:2391
#30 0x00007fffee7feca3 in IA__gtk_main_do_event (event=0x6edc40)
    at /build/buildd/gtk+2.0-2.18.3/gtk/gtkmain.c:1622
#31 0x00007fffee02bcdc in gdk_event_dispatch (source=<value optimized out>, callback=<value optimized out>, 
    user_data=<value optimized out>) at /build/buildd/gtk+2.0-2.18.3/gdk/x11/gdkevents-x11.c:2369
#32 0x00007fffebfc0bbe in g_main_dispatch (context=0x66d940) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:1960
#33 IA__g_main_context_dispatch (context=0x66d940) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2513
#34 0x00007fffebfc4588 in g_main_context_iterate (context=0x66d940, block=<value optimized out>, 
    dispatch=<value optimized out>, self=<value optimized out>)
    at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2591
#35 0x00007fffebfc49e5 in IA__g_main_loop_run (loop=0x6ddb30) at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2799
#36 0x00007fffefdc1706 in bonobo_main () at bonobo-main.c:311
#37 0x0000000000416d0a in main (argc=<value optimized out>, argv=<value optimized out>) at main.c:732