--- Comment #3 from Simon Pepping <> 2010-12-09 07:01:32 EST 
(In reply to comment #0)
> Apparently the KnuthElement's position is null (oldElement.getPosition()). I
> attached a patch which adds an additional check in order to avoid the
> exception. This might not be a real solution, because I'm not sure if it's
> valid that the position is null.

I spent some more time on the validity of a null position. Auxiliary positions
have null subposition, see InlineLayoutManager.getAuxiliaryPosition(), line:

If a position is unwrapped often enough, this null position is reached. The
chosen solution, i.e. not unwrapping if the null position is reached, adds a
layer of wrapping around the null position, because later in the method all
positions are wrapped again. Apparently that is not a problem.

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