Unexpected duplicate Instanced Foliage Actor

Hello everybody! Newcomer in UE4 here.

I was starting to use the Foliage tool to paint into a Landscape. I added a tree mesh and I was able to paint with it, adjust parameters and so on, but when I clicked the Play button to test, this message popped up.

I tried to delete the foliage I have created but it keeps popping up. If I push the “Fix” button, UE4 just crashes.

Any suggestion? I don’t have any previous save of the scene.

Thank you so much!

You ever find a fix?