NPE when replacing address nodes with buildings

[Cobra]

What steps will reproduce the problem?

1. open the attached .osm file (I purged all irrelevant objects)
2. select the address nodes, freeze as reference
3. select the buildings, freeze as subject
4. click replace geometry

What is the expected result?
House numbers (and relation memberships) get assigned to the buildings

What happens instead?
NPE, nothing else

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2012-04-15 01:30:59
Last Changed Author: Don-vip
Revision: 5187
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2012-04-15 00:25:21 +0200 (Sun, 15 Apr 2012)
Last Changed Rev: 5187

Identification: JOSM/1.5 (5187 en)
Memory Usage: 340 MB / 1820 MB (102 MB allocated, but free)
Java version: 1.6.0_31, Sun Microsystems Inc., Java HotSpot(TM) 64-Bit Server VM
Operating system: Linux
Dataset consistency test: No problems found

Plugin: FastDraw (28167)
Plugin: FixAddresses (27907)
Plugin: HouseNumberTaggingTool (27865)
Plugin: ImportImagePlugin (27906)
Plugin: InfoMode (27981)
Plugin: PicLayer (27883)
Plugin: alignways (27852)
Plugin: buildings_tools (27984)
Plugin: conflation (0.1.1)
Plugin: contourmerge (1003)
Plugin: jts (28210)
Plugin: licensechange (27964)
Plugin: measurement (27957)
Plugin: mirrored_download (28108)
Plugin: openstreetbugs (27852)
Plugin: openvisible (27852)
Plugin: pbf (27649)
Plugin: pdfimport (27867)
Plugin: proj4j (27902)
Plugin: restart (27852)
Plugin: reverter (28089)
Plugin: terracer (27852)
Plugin: undelete (27852)
Plugin: utilsplugin2 (28222)

java.lang.NullPointerException
	at org.openstreetmap.josm.plugins.conflation.ConflationToggleDialog$ConflationAction.actionPerformed(ConflationToggleDialog.java:224)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
	at java.awt.Component.processMouseEvent(Component.java:6290)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
	at java.awt.Component.processEvent(Component.java:6055)
	at java.awt.Container.processEvent(Container.java:2039)
	at java.awt.Component.dispatchEventImpl(Component.java:4653)
	at java.awt.Container.dispatchEventImpl(Container.java:2097)
	at java.awt.Component.dispatchEvent(Component.java:4481)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)
	at java.awt.Container.dispatchEventImpl(Container.java:2083)
	at java.awt.Window.dispatchEventImpl(Window.java:2482)
	at java.awt.Component.dispatchEvent(Component.java:4481)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:648)
	at java.awt.EventQueue.access$000(EventQueue.java:84)
	at java.awt.EventQueue$1.run(EventQueue.java:607)
	at java.awt.EventQueue$1.run(EventQueue.java:605)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
	at java.awt.EventQueue$2.run(EventQueue.java:621)
	at java.awt.EventQueue$2.run(EventQueue.java:619)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:618)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

[joshdoe]

Ah, you first need to select an entry from the list before clicking replace geometry. But yes, NPEs are bad, so I'll add a check to disable that button unless an entry is selected. Or maybe I should select the first entry by default? Also, I'd greatly appreciate you giving some feedback, either on #7374 or ​http://wiki.openstreetmap.org/wiki/JOSM/Plugins/Conflation. I've had zero feedback, which is part of why I haven't put much effort into this plugin yet. Feedback will motivate me. :)

[Cobra]

this is fixed now.