I can’t join this server every time I crash
That’s a null. I don’t really know what a null is, but once I tried to make my sp world an online world before I had the forums, and it said it was a null. It wouldn’t let me join either.
I manage to reconnect after searching for the world again and joining through there. Should that not work, it eventually fixes the null problem on its own.
It could refer to a multitude of things.
When I tried again my phone just crashed
Just search it or use the join link, using the same name as you used, and it should fix itself.