Comment 2 for bug 839828

StacktraceTop:
 g_settings_schema_get_string (schema=0x0, key=0x918180 "http/") at /build/buildd/glib2.0-2.29.18/./gio/gsettingsschema.c:254
 g_settings_get_child (settings=0x9011e0, name=0x7f3f3b6d1ea5 "http") at /build/buildd/glib2.0-2.29.18/./gio/gsettings.c:2275
 g_proxy_resolver_gnome_init (resolver=0x9018e0) at gproxyresolvergnome.c:175
 g_type_create_instance (type=<optimized out>) at /build/buildd/glib2.0-2.29.18/./gobject/gtype.c:1885
 g_object_constructor (type=<optimized out>, n_construct_properties=0, construct_params=0x0) at /build/buildd/glib2.0-2.29.18/./gobject/gobject.c:1629