NullPointerException after splitting way with large relation (relation copied 2 times)

[DTeelde]

What steps will reproduce the problem?
Sorry, I cannot give you a reproduceble description. The error happend when I was editing a large relation (3665, NAP-route). Before I have splitted a way (id=6389610, "Borgweg"), member of this relation. I've added a cycleway and added it to the relation. I have deleted a few member. Then this fatal error occured.

After killing the Java-proces in Windows, JOSM has recoverd the data (THANKS for building this feature!). Time of backup was before splitting the way and adding the new cycleway.
Within the recovered file the where 2 new relation (NAP-route, id: 0)! And the old one (id: 3665)

What is the expected result?

What happens instead?

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2011-03-09 12:21:24
Last Changed Author: Upliner
Revision: 3966
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2011-03-09 11:48:50 +0100 (Wed, 09 Mar 2011)
Last Changed Rev: 3966

Identification: JOSM/1.5 (3966 nl)
Memory Usage: 269 MB / 494 MB (93 MB allocated, but free)
Java version: 1.6.0_21, Sun Microsystems Inc., Java HotSpot(TM) Client VM
Operating system: Windows 7
Dataset consistency test: No problems found

Plugin: AddrInterpolation (25199)
Plugin: OpeningHoursEditor (25190)
Plugin: PicLayer (25219)
Plugin: RoadSigns (25192)
Plugin: alignways (25199)
Plugin: colorscheme (25192)
Plugin: openstreetbugs (25540)
Plugin: osmarender (25371)
Plugin: photo_geotagging (25199)
Plugin: public_transport (25192)
Plugin: restart (25199)
Plugin: routing (25199)
Plugin: tageditor (25191)
Plugin: tagging-preset-tester (25191)
Plugin: undelete (25199)
Plugin: waydownloader (25190)

java.lang.NullPointerException
	at org.openstreetmap.josm.gui.dialogs.properties.PropertiesDialog$14.getTableCellRendererComponent(PropertiesDialog.java:660)
	at javax.swing.JTable.prepareRenderer(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.paintCell(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.paintCells(Unknown Source)
	at javax.swing.plaf.basic.BasicTableUI.paint(Unknown Source)
	at javax.swing.plaf.ComponentUI.update(Unknown Source)
	at javax.swing.JComp

[DTeelde]

Recovered file available, but too big to upload (6.3 MB)

[stoecker]

Closed as duplicate of #6431.