On api.getParty("anyParty").delete() it prints an error.

java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot invoke "com.alessiodp.parties.common.players.objects.PartyPlayerImpl.getPlayerUUID()" because "kicked" is null

Fixed with 3.2.9

Can you test with latest version, if not please provide the full error stack trace.