IllegalArgumentException at exit

[Klumbumbus]

What steps will reproduce the problem?

1. start josm
2. create a new data layer
3. create a node
4. delete the layer
5. confirm to delete
6. create a new data layer
7. create a node
8. close josm on red x
9. confirm to close

A regression of core layer changes in plugin editgpx?

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

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-06-12 23:40:12 +0200 (Sun, 12 Jun 2016)
Build-Date:2016-06-13 01:33:32
Revision:10367
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10367 de) Windows 7 32-Bit
Memory Usage: 247 MB / 742 MB (129 MB allocated, but free)
Java version: 1.8.0_91-b14, Oracle Corporation, Java HotSpot(TM) Client VM
VM arguments: [-Djava.security.manager, -Djava.security.policy=file:<java.home>\lib\security\javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>\bin, -Djnlpx.origFilenameArg=C:\Program Files\josm-latest-bla.jnlp, -Djnlpx.remove=true, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.heapsize=256m,768m, -Djnlpx.splashport=51775, -Djnlpx.jvm=<java.home>\bin\javaw.exe, -Djnlpx.vmargs=LURqYXZhLnV0aWwuQXJyYXlzLnVzZUxlZ2FjeU1lcmdlU29ydD10cnVlAA==]

Plugins:
- AddrInterpolation (32158)
- DirectDownload (32158)
- DirectUpload (32158)
- HouseNumberTaggingTool (31926)
- Mapillary (32158)
- OpeningHoursEditor (32158)
- Tracer2 (32158)
- apache-commons (32158)
- apache-http (32158)
- buildings_tools (32158)
- editgpx (32223)
- imagery_offset_db (32158)
- log4j (32158)
- measurement (32158)
- photo_geotagging (32158)
- photoadjust (32158)
- reverter (32158)
- tag2link (31923)
- tagging-preset-tester (32158)
- terracer (32158)
- todo (29154)
- turnrestrictions (32158)
- undelete (32158)
- utilsplugin2 (32158)
- wikipedia (32182)

Tagging presets:
- D:\<user.name>\OSM\JOSMSVN\data\defaultpresets.xml
- D:\<user.name>\OSM\TestNew\newpresets.xml
- http://zibi.openstreetmap.org.pl/kendzi/k/Simple3dPreset/s3db-preset.zip
- https://josm.openstreetmap.de/josmfile?page=Presets/NewTags&zip=1
- https://josm.openstreetmap.de/josmfile?page=Presets/OneClick&zip=1
- https://josm.openstreetmap.de/josmfile?page=Presets/StolpersteineLight&zip=1

Map paint styles:
- D:\<user.name>\OSM\JOSMSVN\styles\standard\elemstyles.mapcss
- D:\<user.name>\OSM\TestNew\newicons.mapcss
- D:\<user.name>\OSM\eigene styles\PriorityRoad\PriorityRoad_1.0.mapcss
- D:\<user.name>\OSM\eigene styles\SpecificBuildingValues\SpecificBuildingValues.mapcss
- D:\<user.name>\OSM\eigene styles\Tourenplanung.mapcss
- D:\<user.name>\OSM\eigene styles\area-symbol.zip
- D:\<user.name>\OSM\patches\old MPs\dataquality.mapcss
- http://www.freietonne.de/ft_icons/josm/FreieTonne_rules_presets_zip.php
- http://www.openrailwaymap.org/styles/standard.mapcss
- https://github.com/bastik/mapcss-tools/raw/osm/mapnik2mapcss/osm-results/mapnik.zip
- https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_Streets&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_buildings&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Cycleways&style&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/DestinationSignRelation&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/HiDPISupport&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/LayerChecker&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Lit&style&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/LitObjects&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Maxspeed&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/MaxspeedIcons&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Modified&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/NewHighwayColors&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Osmc&style&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/ParkingLanes&style&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/ParkingLanes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/ShowID&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Sidewalks&style&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Surface&style&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/sac_scale&zip=1
- https://raw.githubusercontent.com/species/josm-preset-wheelchair/master/sidewalks_kerbs.mapcss

Validator rules:
- D:\<user.name>\OSM\TestNew\new.validator.mapcss
- https://raw.githubusercontent.com/stefan-a-bauer/josm-validators/master/mtb.validator.mapcss

Last errors/warnings:
- W: Old style SideButton usage for action org.openstreetmap.josm.plugins.todo.TodoDialog$SelectAction@146d9dd
- W: Old style SideButton usage for action org.openstreetmap.josm.plugins.todo.TodoDialog$AddAction@1b476ca
- W: Old style SideButton usage for action org.openstreetmap.josm.plugins.todo.TodoDialog$PassAction@8058
- W: Old style SideButton usage for action org.openstreetmap.josm.plugins.todo.TodoDialog$MarkAction@343e3e
- E: java.lang.IllegalArgumentException: Listener was not registered before: LayerChangeAdapter [org.openstreetmap.josm.plugins.editgpx.EditGpxMode@1fa064f]

java.lang.IllegalArgumentException: Listener was not registered before: LayerChangeAdapter [org.openstreetmap.josm.plugins.editgpx.EditGpxMode@1fa064f]
	at org.openstreetmap.josm.gui.layer.LayerManager.removeLayerChangeListener(LayerManager.java:315)
	at org.openstreetmap.josm.gui.layer.LayerManager.removeLayerChangeListener(LayerManager.java:303)
	at org.openstreetmap.josm.actions.JosmAction.destroy(JosmAction.java:220)
	at org.openstreetmap.josm.plugins.editgpx.EditGpxMode.destroy(EditGpxMode.java:193)
	at org.openstreetmap.josm.gui.IconToggleButton.destroy(IconToggleButton.java:70)
	at org.openstreetmap.josm.gui.MapFrame.destroy(MapFrame.java:342)
	at org.openstreetmap.josm.Main.setMapFrame(Main.java:516)
	at org.openstreetmap.josm.Main.removeLayer(Main.java:541)
	at org.openstreetmap.josm.Main.shutdown(Main.java:1134)
	at org.openstreetmap.josm.gui.MainApplication.shutdown(MainApplication.java:116)
	at org.openstreetmap.josm.Main.exitJosm(Main.java:1113)
	at org.openstreetmap.josm.gui.MainFrame$3.windowClosing(MainFrame.java:105)
	at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
	at java.awt.Window.processWindowEvent(Unknown Source)
	at javax.swing.JFrame.processWindowEvent(Unknown Source)
	at java.awt.Window.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(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.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$500(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(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)

[Don-vip]

Fixed in [o32263:32264].