Assignment of book debts void
72.1When an employer in an industry to which this Act applies defaults in the payment of all or part of a contribution owing pursuant to an assessment, or all or part of the money due to the Commission under this Act, any assignment of personal property made by the employer, including an assignment of book debts, is void as against the Commission to the extent of money that has not at the time of default been paid under the assignment to or on behalf of the assignor, regardless of
(a)
whether the assignment is absolute or not, or
(b)
whether the assignment is made before or after the date the contribution or other money became due or the default occurs.