"unexpected error" during data loading

[jrp.crs@…]

Using yahoo wms, I zoomed ot an area i was interested in (partially overlapping one i had already downloaded) hit ctrl-shift-d then enter in quick sucsession, the message apeared. it seems to have not caused any other issues.

Path: trunk
URL: ​http://josm.openstreetmap.de/svn/trunk
Repository Root: ​http://josm.openstreetmap.de/svn
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Revision: 1755
Node Kind: directory
Last Changed Author: stoecker
Last Changed Rev: 1755
Last Changed Date: 2009-07-09 10:53:33 +0200 (Thu, 09 Jul 2009)

Memory Usage: 60 MB / 508 MB (25 MB allocated, but free)
Java version: 1.6.0_07

Plugins: AgPifoJ
Create_grid_of_ways
buildings_tools
lakewalker
measurement
multipoly
openstreetbugs
tageditor
utilsplugin
validator
wmsplugin
Plugin AgPifoJ Version: 16315
Plugin Create_grid_of_ways Version: 16290
Plugin buildings_tools Version: 19
Plugin lakewalker Version: 15961
Plugin measurement Version: 16317
Plugin multipoly Version: ${version.entry.commit.revision}
Plugin openstreetbugs Version: 16294
Plugin tageditor Version: 15707
Plugin utilsplugin Version: 16290
Plugin validator Version: 16409
Plugin wmsplugin Version: 16363

java.lang.NullPointerException

at java.awt.Container.createHierarchyEvents(Unknown Source)
at java.awt.Container.createHierarchyEvents(Unknown Source)
at java.awt.Container.createHierarchyEvents(Unknown Source)
at java.awt.Container.createHierarchyEvents(Unknown Source)
at java.awt.Dialog.conditionalShow(Unknown Source)
at java.awt.Dialog.show(Unknown Source)
at java.awt.Component.show(Unknown Source)
at java.awt.Component.setVisible(Unknown Source)
at java.awt.Window.setVisible(Unknown Source)
at java.awt.Dialog.setVisible(Unknown Source)
at org.openstreetmap.josm.gui.PleaseWaitRunnable.prepareDialog(PleaseWaitRunnable.java:89)
at org.openstreetmap.josm.gui.PleaseWaitRunnable.access$300(PleaseWaitRunnable.java:29)
at org.openstreetmap.josm.gui.PleaseWaitRunnable$5.run(PleaseWaitRunnable.java:141)
at java.awt.event.InvocationEvent.dispatch(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)

[jttt]

Closed as duplicate of #2782.