I just mention it because it is so close to ctrl+H which of course brings up the compass. As this book becomes more well known, I'm sure this bug will happen a little more often. Here is the entire error message:
An error has occured. Please contact the game author for support, as this is likely to be a scripting error and not a bug in AGS.
(ACI version 2.72.920)
in Global script line (13727)
Error: SetActiveInventory: character doesn't have any of that inventory