Ask HN: Insurance Against Patent Trolls

I'm working on a startup that has some Intellectual Property that as far as I know does not overlap with any patents. But I'm a bit worried that at some point a patent troll will come after us for one thing or another.

I'm bootstrapped so I don't have deep pockets.

Is there any form of insurance that can help protect my startup from getting swallowed up by trolls?

I want to emphasize again: I'm not, as far as I know, infringing any patents. I'm not looking to protect against intentional infringement (as I would never intentionally infringe).