Exception selecting Imagery Menu Item

[Glassman]

What steps will reproduce the problem?

1. Open JOSM
2. Open Imagery
3. Do some edits
4. Attempt to add a different background

What is the expected result?

New background imagery loads

What happens instead?

Error - Unexpected Exception Occurred

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: 2017-03-04 03:09:43 +0100 (Sat, 04 Mar 2017)
Build-Date:2017-03-04 02:33:47
Revision:11660
Relative:URL: ^/trunk

Identification: JOSM/1.5 (11660 en) Linux Fedora release 25 (Twenty Five)
Memory Usage: 1515 MB / 7150 MB (775 MB allocated, but free)
Java version: 1.8.0_121-b14, Oracle Corporation, OpenJDK 64-Bit Server VM
Screen: :0.0 3840x1080, :0.1 1920x1080
Maximum Screen Size: 3840x1080
Java package: java-1.8.0-openjdk:x86_64-1.8.0.121
VM arguments: [-agentpath:/usr/lib/abrt-java-connector/libabrt-java-connector.so=abrt=on]
Dataset consistency test: No problems found

Plugins:
+ ImportImagePlugin (33028)
+ ImproveOsm (93)
+ ImproveWay (12)
+ InfoMode (33004)
+ Mapillary (v1.4.0)
+ OpeningHoursEditor (33004)
+ alignways (33136)
+ apache-commons (32994)
+ apache-http (32699)
+ buildings_tools (33004)
+ ejml (32680)
+ ext_tools (33004)
+ geochat (33088)
+ geotools (33042)
+ jts (32699)
+ log4j (32699)
+ measurement (33088)
+ opendata (33156)
+ pbf (33165)
+ pdfimport (33004)
+ public_transport (33166)
+ reverter (33088)
+ routes (33126)
+ splinex (33160)
+ tofix (1485295715)
+ undelete (32699)
+ utilsplugin2 (33124)
+ wikipedia (33098)

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Sidewalks&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Surface&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Surface-DataEntry&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/AddressValidator&zip=1
- https://github.com/gmgeo/osmic-josm-style/archive/master.zip
- https://github.com/igitov/forest-josm-style/archive/master.zip
- https://josm.openstreetmap.de/josmfile?page=Styles/Landcover&zip=1
- ${HOME}/josmfile
- ${HOME}/master.zip
+ ${HOME}/elemstyles.mapcss

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: java.io.IOException: Attribution is not loaded yet
- E: Handled by bug report queue: java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.String
- E: Handled by bug report queue: java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.String
- E: Handled by bug report queue: java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.String
- E: Handled by bug report queue: java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.String


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

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-0 (19) of main
java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.String
	at org.openstreetmap.josm.gui.preferences.ToolbarPreferences.unregister(ToolbarPreferences.java:1133)
	at java.util.Optional.ifPresent(Optional.java:159)
	at org.openstreetmap.josm.gui.ImageryMenu.removeDynamicItems(ImageryMenu.java:273)
	at org.openstreetmap.josm.gui.ImageryMenu.refreshImageryMenu(ImageryMenu.java:148)
	at org.openstreetmap.josm.gui.ImageryMenu$1.menuSelected(ImageryMenu.java:119)
	at javax.swing.JMenu.fireMenuSelected(JMenu.java:1038)
	at javax.swing.JMenu$MenuChangeListener.stateChanged(JMenu.java:1118)
	at javax.swing.DefaultButtonModel.fireStateChanged(DefaultButtonModel.java:349)
	at javax.swing.DefaultButtonModel.setSelected(DefaultButtonModel.java:232)
	at javax.swing.JMenu.setSelected(JMenu.java:305)
	at javax.swing.JMenu.menuSelectionChanged(JMenu.java:1187)
	at javax.swing.MenuSelectionManager.setSelectedPath(MenuSelectionManager.java:125)
	at javax.swing.plaf.basic.BasicMenuUI$Handler.mousePressed(BasicMenuUI.java:450)
	at java.awt.Component.processMouseEvent(Component.java:6530)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
	at java.awt.Component.processEvent(Component.java:6298)
	at java.awt.Container.processEvent(Container.java:2236)
	at java.awt.Component.dispatchEventImpl(Component.java:4889)
	at java.awt.Container.dispatchEventImpl(Container.java:2294)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4522)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
	at java.awt.Container.dispatchEventImpl(Container.java:2280)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
	at java.awt.EventQueue$4.run(EventQueue.java:731)
	at java.awt.EventQueue$4.run(EventQueue.java:729)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

[Don-vip]

Closed as duplicate of #14457.