Transition with keyboard essue

[jaimelxpez]

I'm doing a login interface and I'm having a little bug you can help me. It's happening this:

https://youtu.be/DnrC1mOci3Y

It's going from a view controller to a tab view controller.

I think that's happening because of the keyboard, but I don't know how to solve it.

¿Any ideas? Thanks!