JOSM crashed after making a building rectangularly

[Atalanttore]

What steps will reproduce the problem?
Unfortunately, it happened surprisingly.
I got this error after making a building rectangularly.

What is the expected result?
No problems.

What happens instead?
This error message appeared.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2011-06-06 01:31:37
Last Changed Author: stoecker
Revision: 4125
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2011-06-05 14:15:21 +0200 (Sun, 05 Jun 2011)
Last Changed Rev: 4125

Identification: JOSM/1.5 (4125 de)
Memory Usage: 169 MB / 592 MB (72 MB allocated, but free)
Java version: 1.6.0_22, Sun Microsystems Inc., OpenJDK 64-Bit Server VM
Operating system: Linux
Dataset consistency test: No problems found

Plugin: AddrInterpolation (25199)
Plugin: FixAddresses (25374)
Plugin: ImproveWayAccuracy (26025)
Plugin: OpeningHoursEditor (26002)
Plugin: RoadSigns (25192)
Plugin: alignways (25199)
Plugin: editgpx (25407)
Plugin: ext_tools (25933)
Plugin: lakewalker (25192)
Plugin: mapdust (25839)
Plugin: openstreetbugs (25664)
Plugin: public_transport (25192)
Plugin: reltoolbox (25751)
Plugin: turnrestrictions (26079)
Plugin: undelete (26073)
Plugin: utilsplugin2 (26051)
Plugin: waydownloader (25190)

java.lang.NullPointerException
	at sun.awt.X11.XWindowPeer.restoreTransientFor(XWindowPeer.java:1682)
	at sun.awt.X11.XWindowPeer.removeFromTransientFors(XWindowPeer.java:1748)
	at sun.awt.X11.XWindowPeer.setModalBlocked(XWindowPeer.java:1470)
	at sun.awt.X11.XWindowPeer.setModalBlocked(XWindowPeer.java:1441)
	at java.awt.Window.setModalBlocked(Window.java:1359)
	at java.awt.Dialog.unblockWindow(Dialog.java:1597)
	at java.awt.Dialog.modalHide(Dialog.java:1483)
	at java.awt.Dialog.hideAndDisposePreHandler(Dialog.java:1215)
	at java.awt.Dialog.hide(Dialog.java:1255)
	at java.awt.Component.show(Component.java:1553)
	at java.awt.Component.setVisible(Component.java:1503)
	at java.awt.Window.setVisible(Window.java:881)
	at java.awt.Dialog.setVisible(Dialog.java:1011)
	at javax.swing.JOptionPane$3.propertyChange(JOptionPane.java:1021)
	at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:298)
	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:291)
	at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:229)
	at java.awt.Component.firePropertyChange(Component.java:8152)
	at javax.swing.JOptionPane.setValue(JOptionPane.java:1964)
	at javax.swing.plaf.basic.BasicOptionPaneUI$ButtonActionListener.actionPerformed(BasicOptionPaneUI.java:1201)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2012)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2335)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:404)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:253)
	at java.awt.Component.processMouseEvent(Component.java:6268)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
	at java.awt.Component.processEvent(Component.java:6033)
	at java.awt.Container.processEvent(Container.java:2045)
	at java.awt.Component.dispatchEventImpl(Component.java:4629)
	at java.awt.Container.dispatchEventImpl(Container.java:2103)
	at java.awt.Component.dispatchEvent(Component.java:4455)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4633)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4297)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4227)
	at java.awt.Container.dispatchEventImpl(Container.java:2089)
	at java.awt.Window.dispatchEventImpl(Window.java:2517)
	at java.awt.Component.dispatchEvent(Component.java:4455)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649)
	at java.awt.EventQueue.access$000(EventQueue.java:96)
	at java.awt.EventQueue$1.run(EventQueue.java:608)
	at java.awt.EventQueue$1.run(EventQueue.java:606)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
	at java.awt.EventQueue$2.run(EventQueue.java:622)
	at java.awt.EventQueue$2.run(EventQueue.java:620)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:619)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:194)
	at java.awt.Dialog$1.run(Dialog.java:1072)
	at java.awt.Dialog$3.run(Dialog.java:1126)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.awt.Dialog.show(Dialog.java:1124)
	at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:871)
	at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:668)
	at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:639)
	at org.openstreetmap.josm.actions.OrthogonalizeAction.actionPerformed(OrthogonalizeAction.java:196)
	at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1660)
	at javax.swing.JComponent.processKeyBinding(JComponent.java:2851)
	at javax.swing.KeyboardManager.fireBinding(KeyboardManager.java:285)
	at javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:247)
	at javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.java:2928)
	at javax.swing.JComponent.processKeyBindings(JComponent.java:2920)
	at javax.swing.JComponent.processKeyEvent(JComponent.java:2814)
	at java.awt.Component.processEvent(Component.java:6045)
	at java.awt.Container.processEvent(Container.java:2045)
	at java.awt.Component.dispatchEventImpl(Component.java:4629)
	at java.awt.Container.dispatchEventImpl(Container.java:2103)
	at java.awt.Component.dispatchEvent(Component.java:4455)
...<snip>.

[bastiK]

Not enough info to fix.

[Don-vip]

Closed as duplicate of #6435.