isReactCompositeComponent checking for render function

[CptCompiler]

Hi @elierotenberg, I am using your library. It's working great. Recently I've integrated react-formsy and my app is crashing. I narrowed the problem and think that it is in your isReactCompositeComponent function. Checking if the prototype has a render function is failing. Do you know whats going on there? I Would really appreciate some help.

Andres