Version-Release number of selected component:
evolution-data-server-3.26.1-1.fc27

Additional info:
reporter:       libreport-2.9.2
backtrace_rating: 4
cmdline:        /usr/libexec/evolution-calendar-factory-subprocess --factory ews --bus-name org.gnome.evolution.dataserver.Subprocess.Backend.Calendarx2116x5 --own-path /org/gnome/evolution/dataserver/Subprocess/Backend/Calendar/2116/5
crash_function: g_type_check_instance_is_fundamentally_a
executable:     /usr/libexec/evolution-calendar-factory-subprocess
journald_cursor: s=7118cd78901c4be5acfb70d7aaa70101;i=c27b;b=8d572944d278480ea5fc4e441a73c94c;m=6280301;t=55c4560ccc0e9;x=640361bd5c468ee4
kernel:         4.13.8-300.fc27.x86_64
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 g_type_check_instance_is_fundamentally_a at gtype.c:4023
 #1 g_object_ref at gobject.c:3196
 #2 soup_socket_set_property at soup-socket.c:345
 #3 object_set_property at gobject.c:1439
 #4 g_object_new_internal at gobject.c:1851
 #5 g_object_new_valist at gobject.c:2120
 #6 soup_socket_new at soup-socket.c:824
 #7 soup_connection_connect_async at soup-connection.c:407
 #8 get_connection at soup-session.c:1938
 #9 soup_session_process_queue_item at soup-session.c:1965

Potential duplicate: bug 1361015