insurer to rescind in case of breach.
General Insurance and Surety Corp. v. Ng Hua, 106 Phil 1117
The “other insurance clause” may be subject to waiver but the waiver must either be express or if it is to be implied from conduct mainly, said conduct must be clearly indicative of a clear intent to waive such right. There must be clear showing that the insurer knew about the violation of the clause.