Steps to reproduce:
1. Import JPG (see attached file) without having "Write metadata to file" enabled
2. Select the file after importing in browse mode
3. Crash.

Seems to be caused by wrong numbers/strings in Bibble's exif. F-Spot shouldn't crash anyway, no reason for that.

Stack trace:
[Debug 10:09:28.761] open uri = file:///home/paul/Photos/2009/08/10/DSC_3377.bibble.jpg
Error loading Subdirectory ExifIfdPointer at 8 of 628bytes:
System.Exception: recursive ifd
  at FSpot.Tiff.SubdirectoryEntry.LoadExternal (System.IO.Stream stream) [0x00052] in /usr/src/f-spot/src/Imaging/Tiff.cs:1505 
System.NullReferenceException: Object reference not set to an instance of an object
  at FSpot.Tiff.Header.SelectDirectory (FSpot.Tiff.ImageDirectory dir, StatementSink sink) [0x00000] 
  at FSpot.Tiff.Header.SelectDirectory (FSpot.Tiff.ImageDirectory dir, StatementSink sink) [0x003ca] in /usr/src/f-spot/src/Imaging/Tiff.cs:966 
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.FormatException: Input string was not in the correct format
  at System.Double.Parse (System.String s, NumberStyles style, IFormatProvider provider) [0x00000] 
  at System.Double.Parse (System.String s) [0x00000] 
  at FSpot.Tiff.Rational..ctor (System.String value) [0x00041] in /usr/src/f-spot/src/Imaging/Tiff.cs:359 
  at FSpot.Widgets.InfoBox+ImageInfo.get_ExposureInfo () [0x00075] in /usr/src/f-spot/src/Widgets/InfoBox.cs:389 
  at FSpot.Widgets.InfoBox.UpdateSingle () [0x000bb] in /usr/src/f-spot/src/Widgets/InfoBox.cs:498 
  at FSpot.Widgets.InfoBox.Update () [0x00031] in /usr/src/f-spot/src/Widgets/InfoBox.cs:463 
  at FSpot.Delay.HandleOperation () [0x0000d] in /usr/src/f-spot/src/Core/Delay.cs:40 
  at GLib.Idle+IdleProxy.Handler () [0x00000] 
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at GLib.Idle+IdleProxy.Handler()
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at FSpot.Driver.Main(System.String[] args) in /usr/src/f-spot/src/main.cs:line 345



Other information: