Error in basic imputation

Caught: java.lang.IllegalArgumentException: Cannot compare java.lang.String with value '25' and java.lang.Integer with value '10'
java.lang.IllegalArgumentException: Cannot compare java.lang.String with value '25' and java.lang.Integer with value '10'
	at Main.computeMaritalStatus(Main.groovy:517)
	at Main$_run_closure1$_closure13.doCall(Main.groovy:104)
	at Main$_run_closure1.doCall(Main.groovy:80)

private static Object computeMaritalStatus(it, jsonObject, index) {
    if ((!it.answer.E6) && (it.answer.E5b)) {
        if (it.answer.E5b < 10) {