Minecraft crashes when I play offline

The game crashes after a while (sometimes a hour, other times less) when I play offline. Both Wi-Fi and data OFF but not on airplane mode, with Xbox account constantly logged in. When I play with a Internet connection the game works fine, but when I want to play on my world (any world) offline it crashes.
I also would like to know if this can affect my world in any way, my main world which I also created offline and I don't want it to be buggy or to lose any progress.