Upon opening JOSM encountered error message

[cropper_1@…]

What steps will reproduce the problem?

1. Simply opening JOSM, I did however have another java application I'm developing running in the background

What is the expected result?
For the JOSM to load normally, with the progress bar

What happens instead?
The error message below was presented to me

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2011-04-14 01:31:50
Last Changed Author: bastiK
Revision: 4021
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2011-04-13 22:43:46 +0200 (Wed, 13 Apr 2011)
Last Changed Rev: 4021

Identification: JOSM/1.5 (4021 en_GB)
Memory Usage: 30 MB / 494 MB (10 MB allocated, but free)
Java version: 1.6.0_24, Sun Microsystems Inc., Java HotSpot(TM) Client VM
Operating system: Windows 7

Plugin: openstreetbugs (25664)
Plugin: turnrestrictions (25845)

java.lang.IndexOutOfBoundsException: Index: 3, Size: 3
	at java.util.ArrayList.RangeCheck(Unknown Source)
	at java.util.ArrayList.get(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.Container.createHierarchyEvents(Unknown Source)
	at java.awt.Container.createHierarchyEvents(Unknown Source)
	at java.awt.Container.createHierarchyEvents(Unknown Source)
	at java.awt.Component.hide(Unknown Source)
	at java.awt.Window.hide(Unknown Source)
	at java.awt.Component.show(Unknown Source)
	at java.awt.Component.setVisible(Unknown Source)
	at java.awt.Window.setVisible(Unknown Source)
	at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:228