Game crashes when opening chat in worlds made before update

Whenever I go into a world that was made before the update it s perfectly normal. However, once I click the chat button it was crash the game (go to home screen). But if the world was created after the update it is not affected by this at all, and it doesn't even lag.
Now the wierd part is that if I copy the old world in the settings, the chat works in the copied version and still doesn't work in the old world.