webrunner sometimes emits the following stack trace:
Exception in thread "AWT WServer Thread" oak.lang.NullPointerException
at awt.DisplayItemWindow.locateItem(DisplayItemWindow.oak:263)
at awt.DisplayItemWindow.mouseDrag(DisplayItemWindow.oak:298)
at awt.DisplayItemWindow.mouseMoved(DisplayItemWindow.oak:316)
at awt.Window.handleMouseMoved(Window.oak:149)
Exception in thread "AWT WServer Thread" oak.lang.NullPointerException
at awt.DisplayItemWindow.locateItem(DisplayItemWindow.oak:263)
at awt.DisplayItemWindow.mouseDrag(DisplayItemWindow.oak:298)
at awt.DisplayItemWindow.mouseMoved(DisplayItemWindow.oak:316)
at awt.Window.handleMouseMoved(Window.oak:149)