It seems WK changed their answerChecker.evaluate function.
Replace the following entries (should be 2 each)
(1) answerChecker.evaluate = function(e,t) {
with
(2) answerChecker.evaluate = function(e,t,c) {
and
(1) return answerChecker.oldEvaluateKM(e,t);
with
(2) return answerChecker.oldEvaluateKM(e,t,c);