Every time I try to configure my Minecraft realm, my game crashes and I get this error message:

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

I've tried reinstalling Minecraft and I still get this issue. Please help! - If resetting the realm is a solution, please do it!

I've attached the complete crash report.