gthumb close after removing same files

[William Biggs]

When I try to find the same file in gthumb and remove it . Gthumb will
close and I get this error . Dose any one know how to fix it 
(gthumb:10658): Gtk-WARNING **: Failed to register client:
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
org.gnome.SessionManager was not provided by any .service files

(gthumb:10658): GLib-GIO-CRITICAL **: g_file_new_for_path: assertion
'path != NULL' failed

(gthumb:10658): GLib-GIO-CRITICAL **: g_file_get_uri: assertion
'G_IS_FILE (file)' failed

(gthumb:10658): GLib-GObject-CRITICAL **: g_object_unref: assertion
'G_IS_OBJECT (object)' failed
Gtk-Message: GtkDialog mapped without a transient parent. This is
discouraged.

(gthumb:10658): GLib-GObject-WARNING **: invalid cast from 'GtkDialog'
to 'GthBrowser'
Segmentation fault