17.3 The Parties agree and undertake that they shall not omit to do, or suffer to be done, on any Site or on the Leased Slots, any act or thing which may cause the insurance on the Lessee’s Communication Equipment or the insurance on the Leased Slots and the relevant Towers to become void or voidable, whereby the renewal thereof may be refused or cause the premiums payable on any such insurance to be increased.