Section 34. Waiver of lien

Notwithstanding the provisions of any other law,
  any  contract,  agreement  or understanding whereby the right to file or
  enforce any lien created under article two is waived, shall be  void  as
  against  public  policy and wholly unenforceable. This section shall not
  preclude a requirement for a written waiver  of  the  right  to  file  a
  mechanic's  lien  executed and delivered by a contractor, subcontractor,
  material supplier or laborer simultaneously with or  after  payment  for
  the  labor  performed  or  the materials furnished has been made to such
  contractor, subcontractor,  material  man  or  laborer  nor  shall  this
  section  be applicable to a written agreement to subordinate, release or
  satisfy all or part of such a lien made after a notice of lien has  been
  filed.