Description of problem:
I was modifying the appearence of the window : restablishing date field after having it removed by mistake

Version-Release number of selected component:
evolution-3.10.4-2.fc20

Additional info:
reporter:       libreport-2.2.1
backtrace_rating: 4
cmdline:        evolution
crash_function: g_type_check_instance_is_a
executable:     /usr/bin/evolution
kernel:         3.13.9-200.fc20.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 g_type_check_instance_is_a at gtype.c:3975
 #1 g_object_ref at gobject.c:3057
 #2 e_table_state_load_from_node at e-table-state.c:569
 #3 e_table_state_load_from_file at e-table-state.c:471
 #4 gal_view_etable_attach_tree at gal-view-etable.c:253
 #5 mail_paned_display_view_cb at e-mail-paned-view.c:264
 #6 mail_paned_view_update_view_instance at e-mail-paned-view.c:954
 #10 g_signal_emit_by_name at gsignal.c:3426
 #19 message_list_regen_done_cb at message-list.c:5685
 #20 g_simple_async_result_complete at gsimpleasyncresult.c:777