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I can reproduce that error (or I could yesterday but not today
) It is very intermittent. Going to be difficult to submit a bug report that does not get dumped.
Do you absolutely need the modified file as a psd? An imported psd is not the same as the original anyway, adjustment layers gone, text layers flattened. You might as well save your work as a Gimp .xcf
However, if you need the multilayer psd, maybe to send to someone, try saving as a Gimp .xcf. Close Gimp down, re-start gimp, open the .xcf and try exporting as a psd. I got a sort of 50% success with that.