IAE: Attempted to add listener that was already in list in seachart plugin

[anonymous]

What steps will reproduce the problem?

What is the expected result?

What happens instead?

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: 2016-09-06 00:16:07 +0200 (Tue, 06 Sep 2016)
Build-Date:2016-09-05 22:21:00
Revision:10966
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10966 ru) Windows 8.1 64-Bit
Memory Usage: 514 MB / 900 MB (266 MB allocated, but free)
Java version: 1.8.0_73-b02, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1366x768, \Display1 1920x1080
Maximum Screen Size: 1920x1080
VM arguments: [-Djava.security.manager, -Djava.security.policy=file:<java.home>\lib\security\javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>\bin, -Djnlpx.origFilenameArg=%UserProfile%\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\56\1ee8cfb8-7bed82b7, -Djnlpx.remove=false, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.splashport=1560, -Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp, -Djnlpx.jvm=<java.home>\bin\javaw.exe, -Djnlpx.vmargs=LURqYXZhLnV0aWwuQXJyYXlzLnVzZUxlZ2FjeU1lcmdlU29ydD10cnVlAC1Eam5scC5hcHBsaWNhdGlvbi5ocmVmPWh0dHBzOi8vam9zbS5vcGVuc3RyZWV0bWFwLmRlL2Rvd25sb2FkL2pvc20uam5scAA=]

Dataset consistency test:
[WARN - NO NODES] Way {Way id=425091780 version=1 V nodes=[{Node id=4244200442 version=1 V lat=48.2613986,lon=22.485226}]} has only one node


Plugins:
+ ColorPlugin (1414145445)
+ Create_grid_of_ways (32699)
+ DirectDownload (32699)
+ FastDraw (32938)
+ SeaChart (32699)
+ SeaMapEditor (32767)
+ apache-commons (32699)
+ apache-http (32699)
+ ejml (32680)
+ geojson (43)
+ geotools (32813)
+ gson (32680)
+ imagery-xml-bounds (32699)
+ imagery_offset_db (32796)
+ imageryadjust (32699)
+ jts (32699)
+ mapdust (32787)
+ splinex (32918)
+ turnrestrictions (32796)
+ utilsplugin2 (32815)
+ wikipedia (32884)

Last errors/warnings:
- W: Unable to get color from '' for color preference 'improve.way.accuracy.helper.line'
- W: Unable to get color from '' for color preference 'make.parallel.helper.line'
- W: Unable to get color from '' for color preference 'extrude.main.line'
- W: Unable to get color from '' for color preference 'helper.line'
- W: Unable to get color from '' for color preference 'improve.way.accuracy.helper.line'
- W: Unable to get color from '' for color preference 'make.parallel.helper.line'
- W: Unable to get color from '' for color preference 'extrude.main.line'
- W: Unable to get color from '' for color preference 'helper.line'
- W: Unable to get color from '' for color preference 'improve.way.accuracy.helper.line'
- W: Unable to get color from '' for color preference 'make.parallel.helper.line'


=== REPORTED CRASH DATA ===
BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-2 (54) of javawsApplicationThreadGroup
java.lang.IllegalArgumentException: Attempted to add listener that was already in list: seachart.SeachartAction@6dde300c
	at org.openstreetmap.josm.gui.layer.MainLayerManager.addActiveLayerChangeListener(MainLayerManager.java:175)
	at org.openstreetmap.josm.gui.layer.MainLayerManager.addAndFireActiveLayerChangeListener(MainLayerManager.java:186)
	at seachart.SeachartAction.createChartLayer(SeachartAction.java:131)
	at seachart.SeachartAction$2.run(SeachartAction.java:121)
	at java.awt.event.InvocationEvent.dispatch(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.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)

[malcolmh]

Please update plugin & detail steps that reproduce this problem.

[malcolmh]

In absence of feedback, assume to be fixed