Article 51 4.

Where an existing benchmark does not meet the requirements of this Regulation, but ceasing or changing that benchmark to fulfil the requirements of this Regulation would result in a force majeure event, frustrate or otherwise breach the terms of any financial contract or financial instrument or the rules of any investment fund, which references that benchmark, the use of the benchmark shall be permitted by the competent authority of the Member State where the index provider is located. No financial instruments, financial contracts, or measurements of the performance of an investment fund shall add a reference to such an existing benchmark after 1 January 2020.