It appears that somewhere in your script you're trying to call jjPLAYER::showText on a non-local or undefined player. JJ2+ probably has a bug that makes this action potentially crash the game, thank you for the report; regardless of that though, calling it on a non-local player would have no effect and therefore also likely indicates a bug in your script. The call is likely to have a form of p.showText somewhere in the onLevelLoad hook function but that's just one of the possibilities. In case your code really contains references to the global variable p / jjP as the symptoms would suggest, you should consider completely refraining from its use, as mixing deprecated and new features may and will result in undefined behavior.