I can pretty much guarantee that the question about claims will either be asked when you try and proceed with the cover, or it will be hidden in some small print. Failure to notify the insurers of a material fact with mean that they can repudiate any claim in the future.
My advise is do not risk it. You will be buying false peace of mind. Speak to your broker and, depending on what the claim was for, they may be able to negotiate on the premium.