Mo. Rev. Stat. § 71.980
Notwithstanding any provision to the contrary, the state shall not be held liable for the debts of a municipality that is financially insolvent. For purposes of this section, a municipality is financially insolvent if it is not paying its debts as they become due, unless such debts are the subject of a bona fide dispute, or is unable to pay its debts as they become due.
(L. 2016 S.B. 572)