On 20 Sep 2011, at 22:40, Kevin Perry wrote:

> There's a bug in NSDocument in that it doesn't protect itself against nil 
> return values from -fileNameExtensionForType:saveOperation:. To work around, 
> make sure you return a non-nil value from that method.

Thank you very much!

Now everything works perfectly (if super does return nil, I replace it with 
@"").

Kind regards,

Gerriet.

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