Hmm... did you look up the character using scribble, or using our regular handwriting recognizer? Did you use a Pencil for this?
We've seen a bunch of crashes that appear to originate from a bug in Scribble itself attempting to make an impossible change to a text string (without any involvement of Pleco's code, as far as we can tell) and failing, so it might be something to do with that - hopefully will improve in 14.1 / 14.2.