Description of problem:
When adding an event, clicked Edit Details to set the time of the event, then crash on clicking Save.

Version-Release number of selected component:
gnome-calendar-3.18.2.1-1.fc23

Additional info:
reporter:       libreport-2.6.3
backtrace_rating: 4
cmdline:        /usr/bin/gnome-calendar --gapplication-service
crash_function: gcal_manager_create_event
executable:     /usr/bin/gnome-calendar
journald_cursor: s=f4e3d31c2cd74765bfef86f28866eb2f;i=20f37;b=97df0311a9274dddbe3d30c05a04aa24;m=6a4bdac4;t=529d8c3fd2a64;x=eaa0cc5612de796
kernel:         4.3.3-300.fc23.x86_64
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 gcal_manager_create_event at gcal-manager.c:1479
 #5 _g_closure_invoke_va at gclosure.c:864
 #8 gtk_button_do_release at gtkbutton.c:1899
 #9 gtk_real_button_released at gtkbutton.c:2017
 #14 multipress_released_cb at gtkbutton.c:613
 #15 ffi_call_unix64 at ../src/x86/unix64.S:76
 #16 ffi_call at ../src/x86/ffi64.c:525
 #17 g_cclosure_marshal_generic_va at gclosure.c:1600
 #18 _g_closure_invoke_va at gclosure.c:864
 #21 gtk_gesture_multi_press_end at gtkgesturemultipress.c:273