Setup:
On a simple Stage, I register an EventHandler set to handle KeyEvents.
The EventHandler closes the Stage when triggered.

Action:
I press any key.

Observed behaviour:
The Stage closes, but a NullPointerException is thrown.
No exception is thrown if the key was a "special" key, such as CTRL, ALT, SHIFT or any function key (F1-F12)

Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication$3$1.run(GtkApplication.java:82)
at java.lang.Thread.run(Thread.java:722)

Expected behaviour:
The Stage closes. No exception is thrown.

The attached code illustrates the behaviour.