java.lang.NullPointerException

[meppen7]

1. Start JOSM
2. 'Open' gpx-File
3. Right click on 'Slippy Map' Layer
4. Click on 'Delete'
5. Get the following error message:

Repository Root: ​http://josm.openstreetmap.de/svn
Build-Date: 2009-12-13 02:31:40
Last Changed Author: jttt
Revision: 2623
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: ​http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2009-12-12 21:25:10 +0100 (Sat, 12 Dec 2009)
Last Changed Rev: 2623

Memory Usage: 33 MB / 1016 MB (2 MB allocated, but free)
Java version: 1.6.0_17

Plugins: AddrInterpolation,Create_grid_of_ways,DirectUpload,PicLayer,buildings_tools,colorscheme,dataimport,editgpx,lakewalker,livegps,measurement,michigan_left,multipoly,openvisible,osmarender,plastic_laf,remotecontrol,slippymap,surveyor,tageditor,tagging-preset-tester,terracer,walkingpapers,waydownloader,wmsplugin
Plugin plastic_laf Version: 14016
Plugin AddrInterpolation Version: 18874
Plugin Create_grid_of_ways Version: 17367
Plugin DirectUpload Version: 17532
Plugin PicLayer Version: 19062
Plugin buildings_tools Version: 25
Plugin colorscheme Version: 18413
Plugin dataimport Version: 18071
Plugin editgpx Version: 19052
Plugin lakewalker Version: 18880
Plugin livegps Version: 19056
Plugin measurement Version: 19058
Plugin michigan_left Version: 18084
Plugin multipoly Version: 18962
Plugin openvisible Version: 17536
Plugin osmarender Version: 18971
Plugin remotecontrol Version: 18678
Plugin slippymap Version: 19070
Plugin tageditor Version: 18955
Plugin tagging-preset-tester Version: 14015
Plugin terracer Version: 18924
Plugin walkingpapers Version: 19074
Plugin waydownloader Version: 19047
Plugin wmsplugin Version: 18953
Plugin surveyor Version: 18503

java.lang.NullPointerException

at org.openstreetmap.josm.data.osm.event.DatasetEventManager.activeLayerChange(DatasetEventManager.java:71)
at org.openstreetmap.josm.gui.MapView.fireActiveLayerChanged(MapView.java:107)
at org.openstreetmap.josm.gui.MapView.removeLayer(MapView.java:315)
at org.openstreetmap.josm.Main.removeLayer(Main.java:188)
at org.openstreetmap.josm.gui.dialogs.LayerListDialog$DeleteLayerAction.actionPerformed(LayerListDialog.java:313)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.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.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)

[Gubaer]

This was most likely fixed in r2625.