NPE at ImproveWayAccuracyAction.updateStateByCurrentSelection

[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:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2018-06-21 16:06:43 +0200 (Thu, 21 Jun 2018)
Build-Date:2018-06-22 01:32:07
Revision:13963
Relative:URL: ^/trunk

Identification: JOSM/1.5 (13963 cs) Windows 7 64-Bit
OS Build number: Windows 7 Ultimate (7601)
Memory Usage: 791 MB / 989 MB (270 MB allocated, but free)
Java version: 1.8.0_31-b13, Oracle Corporation, Java HotSpot(TM) Client VM
Screen: \Display0 1280x1024
Maximum Screen Size: 1280x1024

Plugins:
+ Tracer (34109)
+ Tracer-testing (1528739200)
+ Tracer2 (34109)
+ buildings_tools (34212)
+ ejml (34126)
+ geotools (34125)
+ jts (34038)
+ pointInfo (34216)
+ reverter (34271)

Last errors/warnings:
- W: Aktualizovat doplňky - org.openstreetmap.josm.plugins.PluginHandler$UpdatePluginsMessagePanel[,0,0,0x0,invalid,layout=java.awt.GridBagLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=9,maximumSize=,minimumSize=,preferredSize=]
- W: Invalid jar file ''<josm.pref>\plugins\reverter.jar.new'' (exists: false, canRead: false)
- W: Invalid jar file ''<josm.pref>\plugins\pointInfo.jar.new'' (exists: false, canRead: false)
- W: Invalid jar file ''<josm.pref>\plugins\Tracer-testing.jar.new'' (exists: false, canRead: false)
- W: No configuration settings found.  Using hardcoded default values for all pools.
- W: Nemohu najít podporovanou projekci pro vrstvu ortofoto. Používám EPSG:3857.
- W: Nemohu najít podporovanou projekci pro vrstvu ortofoto. Používám EPSG:3857.
- E: java.lang.reflect.InvocationTargetException. Přičina: java.lang.NullPointerException
- E: Handled by bug report queue: java.lang.reflect.InvocationTargetException. Přičina: java.lang.IllegalArgumentException: Listener org.openstreetmap.josm.data.osm.event.SelectionEventManager@1f69b5e (instance of org.openstreetmap.josm.data.osm.event.SelectionEventManager) was already registered.
- E: Handled by bug report queue: java.lang.NullPointerException


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

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-0 (17) of main
java.lang.NullPointerException
	at org.openstreetmap.josm.actions.mapmode.ImproveWayAccuracyAction.updateStateByCurrentSelection(ImproveWayAccuracyAction.java:651)
	at org.openstreetmap.josm.actions.mapmode.ImproveWayAccuracyAction.selectionChanged(ImproveWayAccuracyAction.java:374)
	at org.openstreetmap.josm.data.osm.event.SelectionEventManager$DataListenerInfo.fire(SelectionEventManager.java:94)
	at org.openstreetmap.josm.data.osm.event.SelectionEventManager.fireEvent(SelectionEventManager.java:226)
	at org.openstreetmap.josm.data.osm.event.SelectionEventManager.selectionChanged(SelectionEventManager.java:215)
	at org.openstreetmap.josm.data.osm.event.SelectionEventManager.activeOrEditLayerChanged(SelectionEventManager.java:200)
	at org.openstreetmap.josm.gui.layer.MainLayerManager.fireActiveLayerChange(MainLayerManager.java:287)
	at org.openstreetmap.josm.gui.layer.MainLayerManager.setActiveLayer(MainLayerManager.java:280)
	at org.openstreetmap.josm.gui.layer.MainLayerManager.realRemoveSingleLayer(MainLayerManager.java:320)
	at org.openstreetmap.josm.gui.layer.LayerManager.realRemoveLayer(LayerManager.java:265)
	at org.openstreetmap.josm.gui.layer.LayerManager.lambda$removeLayer$1(LayerManager.java:247)
	at org.openstreetmap.josm.gui.layer.LayerManager$$Lambda$705/1928151.run(Unknown Source)
	at org.openstreetmap.josm.gui.util.GuiHelper.runInEDTAndWaitWithException(GuiHelper.java:234)
	at org.openstreetmap.josm.gui.layer.LayerManager.removeLayer(LayerManager.java:247)
	at org.openstreetmap.josm.gui.dialogs.layer.DeleteLayerAction.actionPerformed(DeleteLayerAction.java:52)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(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)

[Don-vip]

In 13964/josm:

fix #16415 - NPE