Exact same thing happened to me years ago. They informed me that despite a claims free history for years, they would not renew my insurance. Even though they were told no bees were on the property (they weren't) and that no honey was sold from the door., it didn't matter!
I believe they are worried about the liability of you selling a food product. This is something a lot of Mom and Pop farm market vendors need to know.
For example, if Mom sells cookies, or pies, or bread, and someone decides to sue claiming they got ill because of it, your household insurance will not cover you. The moment you start to sell food products made in your kitchen, you are apparently violating the terms of your insurance. What some have to do is then buy additional Commercial Liability insurance (my insurer at the time wasn't interested in that either)!