agent monitor: NullPointerException in WindowDragger.inCloseBox

[SethTisue]

Martin Palát reports:

java.lang.NullPointerException
 at org.nlogo.swing.WindowDragger.inCloseBox(WindowDragger.java:112)
 at org.nlogo.swing.WindowDragger.mouseDragged(WindowDragger.java:90)
 at java.awt.Component.processMouseMotionEvent(Component.java:6338)
 at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3285)
 at java.awt.Component.processEvent(Component.java:6059)

NetLogo 5.0
main: org.nlogo.app.AppFrame
thread: AWT-EventQueue-0
Java HotSpot(TM) Server VM 1.6.0_30 (Sun Microsystems Inc.; 1.6.0_30-b12)
operating system: Windows 7 6.1 (x86 processor)