Has happened a few times now,

crash
and again

Same. mine's happening in the getSeaasonState function
not sure how to fix
log

This happens on the latest version (1.12.2-1.2.17) due the lack of null checks in the way Better Portals compatibility is implemented. If Better Portals compatibility isn't required, the quickest fix is to simply downgrade to 1.12.2-1.2.16.

Is this the same root cause with issue #174, NPE at sereneseasons.handler.season.SeasonHandler.getClientSeasonTime?