error opening prefrences window

[skyper]

I just have updated from version 2595

What steps will reproduce the problem?

1. start josm
2. click on preferences button

What is the expected result?
Preference window opens

What happens instead?
Error message
if you close this message preferences window opens

Please provide any additional information below. Attach a screenshot if
possible.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2009-12-21 02:31:55
Last Changed Author: jttt
Revision: 2668
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2009-12-20 21:01:25 +0100 (Sun, 20 Dec 2009)
Last Changed Rev: 2668

Memory Usage: 16 MB / 508 MB (1 MB allocated, but free)
Java version: 1.6.0_0


Plugins: ColumbusCSV,buildings_tools,colorscheme,editgpx,measurement,osmarender,tageditor,tagging-preset-tester,validator,waydownloader,wmsplugin
Plugin ColumbusCSV Version: 47
Plugin buildings_tools Version: 26
Plugin colorscheme Version: 18413
Plugin editgpx Version: 19052
Plugin measurement Version: 19058
Plugin osmarender Version: 18971
Plugin tageditor Version: 18955
Plugin tagging-preset-tester Version: 14015
Plugin validator Version: 19072
Plugin waydownloader Version: 19047
Plugin wmsplugin Version: 18953

java.lang.NullPointerException
	at java.net.PasswordAuthentication.<init>(PasswordAuthentication.java:57)
	at org.openstreetmap.josm.io.auth.JosmPreferencesCredentialManager.lookup(JosmPreferencesCredentialManager.java:32)
	at org.openstreetmap.josm.gui.preferences.ServerAccessPreference.addGui(ServerAccessPreference.java:47)
	at org.openstreetmap.josm.gui.preferences.PreferenceDialog.<init>(PreferenceDialog.java:139)
	at org.openstreetmap.josm.actions.PreferencesAction.run(PreferencesAction.java:45)
	at org.openstreetmap.josm.actions.PreferencesAction.actionPerformed(PreferencesAction.java:41)
	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.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
	at java.awt.Component.processMouseEvent(Component.java:6108)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3276)
	at java.awt.Component.processEvent(Component.java:5873)
	at java.awt.Container.processEvent(Container.java:2105)
	at java.awt.Component.dispatchEventImpl(Component.java:4469)
	at java.awt.Container.dispatchEventImpl(Container.java:2163)
	at java.awt.Component.dispatchEvent(Component.java:4295)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4461)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4125)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4055)
	at java.awt.Container.dispatchEventImpl(Container.java:2149)
	at java.awt.Window.dispatchEventImpl(Window.java:2478)
	at java.awt.Component.dispatchEvent(Component.java:4295)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:604)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)

[skyper]

screenshot

[Gubaer]

(In [2672]) fixed #4214: error opening prefrences window