Am I overreacting about purchase agreement/insurance ?

So I am currently buying a studio. I won bidding and about to sign a purchase agreement. I am having a mortgage and to get mortgage the property needs to be insured.

I have asked my real estate agent to get a copy of their insurance. Then the last week I asked about insurance again, he said he will call them. Today, I informed him that I will not sign a purchase agreement until the insurance is figured out.

His response is: "You should not worry about it, its a minor thing. They must already have one..." And so on.

The thing that I see in purchase agreement: VvE exists on the paper but in reality is not formed yet. It will be formed around summer. Am I overreacting? From what I read on the internet, I should demand the insurance. If they don't have one, don't sign or withdraw. I am waiting for your advices!