Version-Release number of selected component:
gnome-calendar-3.26.2-1.fc27

Additional info:
reporter:       libreport-2.9.3
backtrace_rating: 4
cmdline:        /usr/bin/gnome-calendar --gapplication-service
crash_function: get_circle_surface_from_color
executable:     /usr/bin/gnome-calendar
journald_cursor: s=515df58361af4156a9e64237919f1a4d;i=8a88;b=e6aecd5709dd4d2a824d171c40f105c6;m=512ba27806;t=562d4da56072c;x=3405daede9bac079
kernel:         4.14.11-300.fc27.x86_64
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 get_circle_surface_from_color at ../src/gcal-utils.c:303
 #1 get_result_metas_cb at ../src/gcal-shell-search-provider.c:199
 #2 ffi_call_unix64 at ../src/x86/unix64.S:76
 #3 ffi_call at ../src/x86/ffi64.c:525
 #4 g_cclosure_marshal_generic at gclosure.c:1490
 #7 g_signal_emitv at gsignal.c:3129
 #8 _gcal_shell_search_provider2_skeleton_handle_method_call at src/gcal-shell-search-provider-generated.c:1669
 #9 g_dbus_interface_method_dispatch_helper at gdbusinterfaceskeleton.c:609
 #10 call_in_idle_cb at gdbusconnection.c:4851
 #15 g_main_context_iteration at gmain.c:3947