Error when updating the gpsblam plugin

[bgirardot]

What steps will reproduce the problem?

1. have the gpsblam plugin installed
2. quit josm and get message gpsblam plugin caused an error
3. select 'update plugin' on dialog box

What is the expected result?

update the plugin or give notice i have the most update version

What happens instead?

josm exception

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: 2016-07-11 23:04:49 +0200 (Mon, 11 Jul 2016)
Build-Date:2016-07-12 01:31:48
Revision:10526
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10526 en) Windows 7 64-Bit
Memory Usage: 371 MB / 910 MB (74 MB allocated, but free)
Java version: 1.8.0_31-b13, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM

Plugins:
- BuildingGeneralization (1010)
- Create_grid_of_ways (32440)
- FastDraw (32639)
- ImportImagePlugin (32584)
- PicLayer (32495)
- apache-commons (32584)
- buildings_tools (32639)
- ejml (32639)
- fieldpapers (v0.4.0)
- geochat (32561)
- geotools (32584)
- gpsblam (32487)
- imagery_offset_db (32528)
- josm-config (1449603193)
- josm-plugin-opengl (1440156917)
- jts (32539)
- log4j (32309)
- measurement (32454)
- opendata (32584)
- pdfimport (32584)
- poly (32584)
- proj4j (32309)
- rasterfilters (32503)
- todo (29154)
- utilsplugin2 (32584)

Tagging presets:
- D:\Downloads\refugee_crisis_EU.xml
- D:\My Documents\hotosm_tasking_manager_project_1245.xml
- D:\MyRealDocuments\blake-josm-presets-damage.xml
- https://raw.githubusercontent.com/OpenSeaMap/josm/master/INT-1-preset.xml

Map paint styles:
- D:\MyRealDocuments\<user.name>HOTValidate.zip
- https://github.com/hotosm/HDM-JOSM-style/archive/master.zip

Last errors/warnings:
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: Old style SideButton usage for action org.openstreetmap.josm.gui.conflict.tags.CombinePrimitiveResolverDialog$ApplyAction@49b70741
- W: Old style SideButton usage for action org.openstreetmap.josm.gui.conflict.tags.CombinePrimitiveResolverDialog$CancelAction@f9f1a58
- W: Old style SideButton usage for action org.openstreetmap.josm.gui.help.ContextSensitiveHelpAction@1f0b6b86
- E: java.lang.NullPointerException
- E: java.lang.IllegalArgumentException: Listener was not registered before: org.openstreetmap.josm.plugins.gpsblam.GPSBlamMode@3ca277e6

java.lang.IllegalArgumentException: Listener was not registered before: org.openstreetmap.josm.plugins.gpsblam.GPSBlamMode@3ca277e6
	at org.openstreetmap.josm.gui.layer.LayerManager.removeLayerChangeListener(LayerManager.java:379)
	at org.openstreetmap.josm.gui.layer.LayerManager.removeLayerChangeListener(LayerManager.java:367)
	at org.openstreetmap.josm.plugins.gpsblam.GPSBlamMode.destroy(GPSBlamMode.java:224)
	at org.openstreetmap.josm.gui.IconToggleButton.destroy(IconToggleButton.java:72)
	at org.openstreetmap.josm.gui.MapFrame.destroy(MapFrame.java:341)
	at org.openstreetmap.josm.gui.MainPanel.updateContent(MainPanel.java:58)
	at org.openstreetmap.josm.gui.MainPanel$1.afterLastLayerRemoved(MainPanel.java:162)
	at org.openstreetmap.josm.gui.layer.MainLayerManager.realRemoveSingleLayer(MainLayerManager.java:290)
	at org.openstreetmap.josm.gui.layer.LayerManager.realRemoveLayer(LayerManager.java:229)
	at org.openstreetmap.josm.gui.layer.LayerManager$2.run(LayerManager.java:213)
	at org.openstreetmap.josm.gui.util.GuiHelper.runInEDTAndWaitWithException(GuiHelper.java:146)
	at org.openstreetmap.josm.gui.layer.LayerManager.removeLayer(LayerManager.java:210)
	at org.openstreetmap.josm.gui.layer.LayerManager.resetState(LayerManager.java:438)
	at org.openstreetmap.josm.gui.layer.MainLayerManager.resetState(MainLayerManager.java:396)
	at org.openstreetmap.josm.Main.shutdown(Main.java:1178)
	at org.openstreetmap.josm.gui.MainApplication.shutdown(MainApplication.java:117)
	at org.openstreetmap.josm.Main.exitJosm(Main.java:1159)
	at org.openstreetmap.josm.gui.MainFrame$3.windowClosing(MainFrame.java:105)
	at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
	at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
	at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
	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$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.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$1.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)