When I log in on 1.13, I try to join the realm that I play on but then it crashes instantly. My other friends on the realm also cannot join even thought it says four of them are on. Please help!

When I log in on 1.13, I try to join the realm that I play on but then it crashes instantly. My other friends on the realm also cannot join even thought it says four of them are on. I look at it and it says, "A fatal error has been detected by the Java Runtime environment," and a bunch of other complicated stuff. Please help!