Bug when creating cashier in a teller without an end date

When a User creates a teller without an end date, then proceeds to create a cashier for this teller the following error appears

05:34:05.816 [http-bio-443-exec-6] ERROR o.s.boot.context.web.ErrorPageFilter - Forwarding to error page from request [/api/v1/tellers/1/cashiers] due to exception [Partial cannot be null]
java.lang.IllegalArgumentException: Partial cannot be null
    at org.joda.time.base.AbstractPartial.isAfter(AbstractPartial.java:351) ~[joda-time-2.8.1.jar:2.8.1]
    at org.apache.fineract.organisation.teller.data.CashierTransactionDataValidator.validateCashierAllowedDateAndTime(CashierTransactionDataValidator.java:99) ~[classes/:na]