Closing message that was "Open New Window"ed

Right click on a message in message list, select “Open in New Window”. When done try to close the message with the X on the message tab (not the window’s X). You should get a “Problem Occured” dialog that has this message:

An internal error occurred during: “Close Document”.

java.lang.NullPointerException

Subject: thanks for reporting, this has been fixed in a recent 8.5 build <>