Any holder of any mortgage or the assignee or the administrator or executor of any deceased mortgagee or deceased assignee, or the heirs or legatees of any deceased mortgagee or deceased assignee of any mortgage which is defectively released or assigned, and which has remained unchallenged on the records for a period of more than five (5) years prior to the taking effect of this act, and more than five (5) years have elapsed since the time the indebtedness secured by such mortgage became due and payable shall have one (1) year from July 1, 1957, in which to commence an action in the district court of the county where the land is situated, to set aside such assignment or release, and, if such action by any mortgagee or assignee or the administrator or executor of any deceased mortgagee or deceased assignee, or the heirs or legatees of any deceased mortgagee or deceased assignee, shall not be commenced within one (1) year from July 1, 1957, then such mortgagee or assignee thereof, or any holder of said mortgage shall forever be barred from bringing any action in any court of the state of Kansas, to set aside such assignment or release: Provided, That this amendment shall not revive any rights or actions previously barred.