Game crashes completely if in (F2) Professionals report for specific profession to click on those in a ship.
For example, when seeing where carpenters are, and click on those on a ship, then the game crashes/disappears entirely, and player would need to restore from automatically-saved-before-turn and remake all moves (that with hundreds of units can make feel intimidating and daunting).
It may be crashing only for the case when that ship is off the map, i.e. on the way to/from Europe.
I guess, (?F8) Naval Adviser report can be shown.
Or just do nothing. Just recall that currently all professionals on ships in report are shown as clickable.
So if doing nothing, then those in report must be unclickable.
This is actually very old bug. It is sad to forget and run into it again.
I hope the time has come to get rid of it.