coding issue message when a calc is deleted with validation of data

[Manu1400]

What steps will reproduce the problem?

1. Run JOSM
2. New calc (File->New calc)
3. Trace a simple way
4. Apply "highway=residential"
5. File->Send data
6. Suspect Data -> Cancel
7. List of cacl(s)->Delete Calc n°1
8. Delete now
9. The calc is deleted but i have a coding issue message !

The bug is reproductible :

• I have restart Josm and i have the problem.
• I don't have this problem with the version 'tested' of JOSM

Note : My plugins is not updated.

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2013-04-26 01:34:33
Last Changed Author: Don-vip
Revision: 5904
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2013-04-26 00:35:45 +0200 (Fri, 26 Apr 2013)
Last Changed Rev: 5904

Identification: JOSM/1.5 (5904 fr) Windows 7 64-Bit
Memory Usage: 100 MB / 247 MB (9 MB allocated, but free)
Java version: 1.7.0_17, Oracle Corporation, Java HotSpot(TM) Client VM
VM arguments: [-Djava.security.policy=file:C:\Program Files (x86)\Java\jre7\lib\security\javaws.policy, -DtrustProxy=true, -Xverify:remote, -Djnlpx.home=C:\Program Files (x86)\Java\jre7\bin, -Djnlpx.origFilenameArg=C:\Users\Emmanuel\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\53\5c3539b5-35b018e3, -Djnlpx.remove=false, -Dsun.awt.warmup=true, -Xbootclasspath/a:C:\Program Files (x86)\Java\jre7\lib\javaws.jar;C:\Program Files (x86)\Java\jre7\lib\deploy.jar;C:\Program Files (x86)\Java\jre7\lib\plugin.jar, -Djnlpx.splashport=54070, -Djnlp.application.href=http://josm.openstreetmap.de/download/josm-latest.jnlp, -Djnlpx.jvm=C:\Program Files (x86)\Java\jre7\bin\javaw.exe, -Djnlpx.vmargs=-Djnlp.application.href=http://josm.openstreetmap.de/download/josm-latest.jnlp]

Plugin: FastDraw (29532)
Plugin: geotools (29435)
Plugin: imageryadjust (29435)
Plugin: jts (29435)
Plugin: opendata (29505)
Plugin: reverter (29503)
Plugin: utilsplugin2 (29435)

java.lang.NullPointerException
	at org.openstreetmap.josm.gui.layer.ValidatorLayer.layerRemoved(ValidatorLayer.java:158)
	at org.openstreetmap.josm.gui.MapView.fireLayerRemoved(MapView.java:176)
	at org.openstreetmap.josm.gui.MapView.removeLayer(MapView.java:414)
	at org.openstreetmap.josm.Main.removeLayer(Main.java:296)
	at org.openstreetmap.josm.gui.dialogs.LayerListDialog$DeleteLayerAction.actionPerformed(LayerListDialog.java:397)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$200(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

[Don-vip]

In 5907/josm:

fix #8642 - Fix NPE when deleting osm data layer with active validator layer