JOSM crash dialog after trying to delete a mixed layer

[anonymous]

What steps will reproduce the problem?

1. Open several gpx tracks(gpx files with markers)
2. Merge markers into one layer. Merge gpx files into one layer.
3. Delete merged layer when unneeded.

What is the expected result?

Successful deletion of unneeded layer

What happens instead?

"Report bug" dialog

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

I think the same happened yesterday, but with combined(merged)gpx layers. Today it happened with combined markers.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2026-08-11 15:36:21 +0200 (Tue, 11 Aug 2026)
Revision:19613
Build-Date:2026-08-12 01:30:51
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (19613 en) Linux Debian GNU/Linux 12 (bookworm)
Memory Usage: 1536 MB / 1536 MB (1296 MB allocated, but free)
Java version: 26.0.2+13, BellSoft, OpenJDK 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.motif.MotifLookAndFeel
Screen: :0.0 1024x768x[Multi depth]@75Hz (scaling 1.00×1.00)
Maximum Screen Size: 1024×768
Best cursor sizes: 16×16→16×16, 32×32→32×32
Environment variable LANG: en_US.UTF-8
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
Locale info: en_US
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: LXDE
libcommons-compress-java: libcommons-compress-java:all-1.22-1
libcommons-logging-java: libcommons-logging-java:all-1.2-3
fonts-noto: fonts-noto:all-20201225-1
VM arguments: [--module-path=/usr/share/openjfx/lib, --add-modules=java.scripting,java.sql,javafx.controls,javafx.media,javafx.swing,javafx.web, -Djosm.restart=true, -Djava.net.useSystemProxies=true, -XX:MaxRAMPercentage=75.0, --add-exports=java.base/sun.security.action=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED]
Dataset consistency test: No problems found

Plugins:
+ CADTools (23)
+ FastDraw (36503)
+ ImageWayPoint (36483)
+ JOSM.Missing.Tools (1.0.0-1-g417d579)
+ MultiLineToolbar (1767556793)
+ OpeningHoursEditor (36493)
+ PerpendicularWayFromNode (1.0.0)
+ Review.Changes (1.1.1)
+ SimplifyArea (36503)
+ adaptive-simplifier (2.8.0)
+ apache-commons (36483)
+ apache-http (36483)
+ buildings_tools (36503)
+ comfort0 (36483)
+ conflation (280)
+ contourmerge (v0.2.3)
+ ejml (36483)
+ geotools (36483)
+ gpsblam (36483)
+ gridify (61)
+ jackson (36502)
+ jaxb (36483)
+ jna (36483)
+ jts (36483)
+ merge-overlap (36483)
+ opendata (36503)
+ osm-obj-info (72)
+ reverter (36503)
+ sidewalks (71)
+ undelete (36503)
+ utilsplugin2 (36503)
+ waydownloader (36483)
+ wikipedia (448)
+ zoomlevel (0.1.0)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/Addr2&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/BuildingPreset&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Crafts&zip=1
+ https://cdn.jsdelivr.net/npm/name-suggestion-index@latest/dist/presets/nsi-josm-presets.min.xml
+ 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/ParcelLockers&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Playground_Equipment&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Simple_Indoor_Tagging&zip=1
+ https://osmtools.de/josm/steps.xml
+ https://josm.openstreetmap.de/josmfile?page=Presets/ParkingLanes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/LaneAttributes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/PublicTransportOneClick&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Quick-highways&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/CommonKeyboardShortcuts&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/FitnessStationEquipment&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/NewParkingFeatures&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/StreetCabinet&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Quick-buildings&zip=1

Map paint styles:
- https://raw.githubusercontent.com/tordanik/direction-cones-style/refs/heads/main/direction-cones.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/AddressValidator&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/SidewalksAndFootways&zip=1
- https://raw.githubusercontent.com/species/josm-preset-traffic_sign_direction/master/direction.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/Direction&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_Streets&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Lit&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/BuildingColors&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Enhanced_Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/ColorWays&zip=1
- https://raw.githubusercontent.com/yopaseopor/indoormap/master/indoormap-style.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/FixmeAndNote&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Landcover&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/LastUpdated&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/Surface&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Modified&zip=1

Validator rules:
+ https://josm.openstreetmap.de/josmfile?page=Rules/CheckDate&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Rules/MissingMain&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Rules/UnresolvedFIXMEs&zip=1

Last errors/warnings:
- 00072.732 W: [NODE, CLOSEDWAY] construction: Could not get presets icon aux/construction.svg
- 00072.808 W:  building=* agricultural: Could not get presets icon agri/greenhouse.svg
- 00072.809 W: [NODE, CLOSEDWAY] greenhouse: Could not get presets icon agri/greenhouse.svg
- 00072.813 W: [NODE, CLOSEDWAY] cowshed: Could not get presets icon agri/creepy-cow.svg
- 00072.813 W: [NODE, CLOSEDWAY] sty: Could not get presets icon agri/pig.svg
- 00072.842 W: [NODE, CLOSEDWAY] college: Could not get presets icon civic/college.svg
- 00072.851 W: [NODE, CLOSEDWAY] university: Could not get presets icon civic/uni.svg
- 00072.855 W: [NODE, CLOSEDWAY] transportation: Could not get presets icon civic/train.svg
- 00129.186 E: Failed to locate image 'mapmode/presets/transport/way/way_pedestrian.svg'
- 01256.651 E: Handled by bug report queue: java.lang.IllegalArgumentException: Listener org.openstreetmap.josm.gui.layer.markerlayer.Marker$$Lambda/0x0000000035a3faa8@28e4d67a (instance of org.openstreetmap.josm.gui.layer.markerlayer.Marker$$Lambda/0x0000000035a3faa8) was not registered before or already removed.



=== REPORTED CRASH DATA ===
LayerManager#fireLayerRemoving:
 - listener: org.openstreetmap.josm.gui.MapView[,0,0,589x581,alignmentX=0.0,alignmentY=0.0,border=,flags=0,maximumSize=,minimumSize=java.awt.Dimension[width=10,height=0],preferredSize=]
 - event: LayerRemoveEvent [removedLayer=MarkerLayer [name=Markers from 20260916-155505.gpx, associatedFile=/home/fraxinus-user1/tracks/tracks/GPS_Logger/20260916-155505.gpx, visible=false], lastLayer=false]
 - layer: MarkerLayer [name=Markers from 20260916-155505.gpx, associatedFile=/home/fraxinus-user1/tracks/tracks/GPS_Logger/20260916-155505.gpx, visible=false]

BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-0 (31) of main
java.lang.IllegalArgumentException: Listener org.openstreetmap.josm.gui.layer.markerlayer.Marker$$Lambda/0x0000000035a3faa8@28e4d67a (instance of org.openstreetmap.josm.gui.layer.markerlayer.Marker$$Lambda/0x0000000035a3faa8) was not registered before or already removed.
	at org.openstreetmap.josm.tools.ListenerList.failRemove(ListenerList.java:136)
	at org.openstreetmap.josm.tools.ListenerList.removeListener(ListenerList.java:130)
	at org.openstreetmap.josm.data.Preferences.removeKeyPreferenceChangeListener(Preferences.java:248)
	at org.openstreetmap.josm.gui.layer.markerlayer.Marker.destroy(Marker.java:446)
	at java.base/java.lang.Iterable.forEach(Unknown Source)
	at org.openstreetmap.josm.gui.layer.markerlayer.MarkerLayer.destroy(MarkerLayer.java:195)
	at org.openstreetmap.josm.gui.MapView.layerRemoving(MapView.java:421)
	at org.openstreetmap.josm.gui.layer.LayerManager.fireLayerRemoving(LayerManager.java:479)
	at org.openstreetmap.josm.gui.layer.LayerManager.realRemoveSingleLayer(LayerManager.java:281)
	at org.openstreetmap.josm.gui.layer.MainLayerManager.realRemoveSingleLayer(MainLayerManager.java:350)
	at org.openstreetmap.josm.gui.layer.LayerManager.realRemoveLayer(LayerManager.java:269)
	at org.openstreetmap.josm.gui.layer.LayerManager.lambda$removeLayer$1(LayerManager.java:251)
	at org.openstreetmap.josm.gui.util.GuiHelper.runInEDTAndWaitWithException(GuiHelper.java:247)
	at org.openstreetmap.josm.gui.layer.LayerManager.removeLayer(LayerManager.java:251)
	at org.openstreetmap.josm.gui.dialogs.layer.DeleteLayerAction.actionPerformed(DeleteLayerAction.java:52)
	at java.desktop/javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at java.desktop/javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.desktop/java.awt.Component.processMouseEvent(Unknown Source)
	at java.desktop/javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.desktop/java.awt.Component.processEvent(Unknown Source)
	at java.desktop/java.awt.Container.processEvent(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.run(Unknown Source)

[skyper]

Closed as duplicate of #23520.