NPE when attempting to combine ways

[anonymous]

If you look at this bit of map:

​http://www.openstreetmap.org/?lat=53.026997&lon=-2.78187&zoom=19

Select the tiny segment just below the fork and the segment below that and try and
combine them with 'c' and you get:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.7.0
Created-By: 10.0-b23 (Sun Microsystems Inc.)
Main-class: JOSM
Main-Version: 1620 SVN
Main-Date: 2009-05-24T21:19:53.005289ZJava version: 1.6.0_07
Plugins: DirectUpload;colorscheme;measurement;openvisible;tageditor;utilsplugin;validator;wmsplugin
Plugin DirectUpload Version: 14133
Plugin colorscheme Version: 14233
Plugin measurement Version: 14015
Plugin openvisible Version: 14233
Plugin tageditor Version: 14523
Plugin utilsplugin Version: 14356
Plugin validator Version: 14123
Plugin wmsplugin Version: 14120

java.lang.NullPointerException

at org.openstreetmap.josm.tools.Pair.hashCode(Pair.java:17)
at java.util.HashMap.getEntry(HashMap.java:344)
at java.util.HashMap.containsKey(HashMap.java:335)
at org.openstreetmap.josm.actions.CombineWayAction.actionPerformed(CombineWayAction.java:92)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2849)
at javax.swing.KeyboardManager.fireBinding(KeyboardManager.java:267)
at javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:216)
at javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.java:2926)
at javax.swing.JComponent.processKeyBindings(JComponent.java:2918)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2812)
at java.awt.Component.processEvent(Component.java:5818)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4413)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:697)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:962)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:834)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:661)
at java.awt.Component.dispatchEventImpl(Component.java:4285)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Window.dispatchEventImpl(Window.java:2440)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)