theres a bug with psych engine (0.6.2) where a lot of lua calls will crash the game if the function doesnt exist in a script (trying to call nil)
however a LOT of nil calls is needed for this to happen (around 30k i think) so only the update functions are really a problem because they are called much more often than the others
if youre working on a mod make sure every script has both onUpdate and onUpdatePost or else long songs or ppl on high fps will crash!!!!! (they can even be empty and without params and itll still work)