How to reproduce:
Type the following command in chat:
/tp @p[x_rotation]or
/tp @p[x_rotation=By completing the selector with a "=" or "}":
/tp @e [x_rotation=], it will crash the game.
Crash message:
The game crashed whilst chartyped event handler
Error: java.lang.NullPointerException: charTyped event handlerCrash report included.
Edit2: Nvm, distance also has floating point and ranges and does not crash.
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My very wild guess would be, it has something to do with the fact, that x_rotation supports floating point values and supports value ranges, which both uses points "." to specify. This might confuse the parser and
JebDinnerbone didn't test it thoroughly enough yet.x_rotation=1.2..3.4Edit: Even though it crashes on certain occasions while typing, if you just paste a valid command it does what you would expect it to.