In the business world, insurance is important to have for the continuity of the business that is being run. Sea freight companies insure the cargo being transported with Marine Cargo Insurance. Sea Freight Insurance is insurance that covers the occurrence of risks during the process of transporting goods from the seller's warehouse to the buyer's warehouse. Marine cargo insurance as an insurance agreement in general, is an agreement that create binding rights and obligations for the parties. The insurance agreement agreed upon by the Insured and the Insurer will be written in a document called “insurance policy”, which regulates the terms and conditions of the agreement. In practice, the insured often file a claim without regard to the warranty in the policy, so that in the end the claim ends up being rejected because the insured has violated the warranty in the policy or in other words the Insured has comitted breach of warranty. In the end, this study explains that all forms of violation of the warranty in the policy, both written and unwritten warranty, will have legal consequences that eliminate the insurer's liability to compensate for losses suffered by the insured
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