Steps to reproduce:

1. import a photo, put a new tag on it
2. Select the tag on the sidebar to show only photos with that tag
3. Double click the photo there (should be only one) to bring up the larger view
4. right click on the large image, and select "Delete from drive"


Stack trace:
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.ArgumentNullException: Argument cannot be null.
Parameter name: key
  at System.Collections.Generic.Dictionary`2[System.Object,System.Object].set_Item (System.Object key, System.Object value) [0x00000] 
  at FSpot.Utils.DisposableCache`2[System.String,Gdk.Pixbuf].Add (System.String key, Gdk.Pixbuf value) [0x00000] 
  at FSpot.Widgets.Filmstrip.GetPixbuf (Int32 i, Boolean highlighted) [0x00000] 
  at FSpot.Widgets.Filmstrip.GetPixbuf (Int32 i) [0x00000] 
  at FSpot.Widgets.Filmstrip.OnExposeEvent (Gdk.EventExpose evnt) [0x00000] 
  at Gtk.Widget.exposeevent_cb (IntPtr widget, IntPtr evnt) [0x00000] 
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at Gtk.Widget.exposeevent_cb(IntPtr widget, IntPtr evnt)
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Gnome.Program.Run()
   at FSpot.Driver.Main(System.String[] args)


Other information: