snapping to tile size cause runtimeerrors

[Bürste]

If you click on snap to tile size (which is else not translated yet) causes an runtimeerror:

Repository Root: ​http://josm.openstreetmap.de/svn
Build-Date: 2009-11-18 02:32:06
Last Changed Author: stoecker
Revision: 2468
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: ​http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2009-11-17 17:33:31 +0100 (Tue, 17 Nov 2009)
Last Changed Rev: 2468

Memory Usage: 63 MB / 508 MB (14 MB allocated, but free)
Java version: 1.6.0_03

Plugins: AgPifoJ
editgpx
nearclick
openvisible
remotecontrol
slippymap
tageditor
tagging-preset-tester
terracer
validator
waydownloader
wmsplugin
Plugin AgPifoJ Version: 18593
Plugin editgpx Version: 18595
Plugin nearclick Version: 17705
Plugin openvisible Version: 17536
Plugin remotecontrol Version: 18678
Plugin slippymap Version: 18593
Plugin tageditor Version: 18522
Plugin tagging-preset-tester Version: 14015
Plugin terracer Version: 17874
Plugin validator Version: 18623
Plugin waydownloader Version: 18617
Plugin wmsplugin Version: 18671

java.lang.NullPointerException

at org.openstreetmap.josm.plugins.slippymap.SlippyMapLayer$7.actionPerformed(SlippyMapLayer.java:216)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$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.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)