This chapter may not be amended to have a material, adverse effect upon the rights of the holders of any outstanding bonds without the written consent of the bond holders, except as follows: this chapter may be amended at any time if the amendment is needed to cure an ambiguity or to correct or supplement a defective provision; if the city council finds that the amendment will not materially impair or adversely affect the city's interests or the interests of any bond holder; or if the amendment will apply solely to bonds issued after its effective date. (Ord. 2012-039 § 2)