::MSU.getDummyPlayer() is currently only allowed to create a dummy player, once the first world has been initiatlized during that game session. Any time before that and this function returns null
Problem
Mods, which utilize the dummyPlayer during Scenarios (e.g. for displaying nested tooltips) can't do so, because will be null here.
The player has to first load a random game and quit to the main menu, before he can finally play scenarios without issues.