Realm crash when trying to access on configure realm as realm owner

Realm crash when trying to access on configure realm as realm owner.

I uploaded a map on realm to play with my friend.

And then showed "saving world" very quickly and minecraft crashed. and luncher showed

"The game crashed whilst rendering screen
Error: java.lang.NullPointerException: Cannot invoke "java.awt.image.BufferedImage.getWidth()" because "☃" is null
Exit Code: -1"

I tried again over several times but same error, keep crash.

Reinstall java or minecraft wasn't work.

I think the map I uploaded is problem.

But I can't access to realm setting so I can not remove that map or change to other map.

File below is my lastest crash report.