NPE at DataSetChangesetBuilder.processRelationPoint

[anonymous]

What steps will reproduce the problem?

1. I tried to use the "changeset viewer" plugin and received an error saying that multiple plugins would not be loaded.

What is the expected result?

Being able to view changeset history using the plugin.

What happens instead?

I receive an error saying the plugin could not be loaded.

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: 2020-11-21 14:56:29 +0100 (Sat, 21 Nov 2020)
Build-Date:2020-11-22 02:30:52
Revision:17329
Relative:URL: ^/trunk

Identification: JOSM/1.5 (17329 en) Mac OS X 10.16
OS Build number: macOS 11.0.1 (20B29)
Memory Usage: 1830 MB / 1830 MB (675 MB allocated, but free)
Java version: 1.8.0_271-b09, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.apple.laf.AquaLookAndFeel
Screen: Display 69733632 1440x900 (scaling 1.0x1.0), Display 188945226 1920x1080 (scaling 1.0x1.0), Display 84042945 1920x1080 (scaling 1.0x1.0)
Maximum Screen Size: 1920x1080
Best cursor sizes: 16x16 -> 16x16, 32x32 -> 32x32
VM arguments: [-Djava.security.policy=file:<java.home>/lib/security/javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>/bin, -Djava.security.manager, -Djnlpx.origFilenameArg=${HOME}/Library/Application Support/Oracle/Java/Deployment/cache/6.0/56/1ee8cfb8-377f244e, -Djnlpx.remove=false, -Dsun.awt.warmup=true, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.heapsize=NULL,2048m, -Dmacosx.jnlpx.dock.name=JOSM, -Dmacosx.jnlpx.dock.icon=${HOME}/Library/Application Support/Oracle/Java/Deployment/cache/6.0/25/4c122699-697effe2.icns, -Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp , -Djnlpx.jvm="<java.home>/bin/java"]
Dataset consistency test: No problems found

Plugins:
+ Mapillary (1.5.27)
+ apache-commons (35524)
+ apache-http (35589)
+ auto_tools (73)
+ buildings_tools (35640)
+ changeset-viewer (22)
+ continuosDownload (91)
+ graphview (35640)
+ javafx-osx (35458)
+ jna (35458)
+ markseen (14)
+ openqa (0.2.0)
+ osm-obj-info (56)
+ reverter (35640)
+ rex (53)
+ utilsplugin2 (35640)

Tagging presets:
+ https://raw.githubusercontent.com/osmlab/name-suggestion-index/master/dist/name-suggestions.presets.xml
+ /Applications/JOSM-Buddy/assets/presets/heading.xml

Map paint styles:
+ https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_Streets&zip=1
+ https://raw.githubusercontent.com/KaartGroup/Kaart-Styles/master/Kaart-Styles.mapcss
+ https://raw.githubusercontent.com/KaartGroup/Kaart-Styles/master/Overlapping%20Ways.mapcss
- ${HOME}/Desktop/Paintstyle:validator checks/Clingstone/New Test QC.mapcss
- https://raw.githubusercontent.com/KaartGroup/Kaart-Styles/master/Kaart_QC_Quandary.mapcss
- ${HOME}/Desktop/Paintstyle:validator checks/Clingstone/New Test QC.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/LayerChecker&zip=1

Validator rules:
+ https://raw.githubusercontent.com/KaartGroup/KaartValidator/master/kaart.clingstone.validator.mapcss
+ /Applications/JOSM-Buddy/assets/validators/forbidden-tag-check.validator.mapcss
- https://raw.githubusercontent.com/KaartGroup/KaartValidator/master/kaart.indonesiaNames.validator.mapcss
- https://raw.githubusercontent.com/KaartGroup/KaartValidator/master/kaart.durazno.validator.mapcss
- ${HOME}/Desktop/Paintstyle:validator checks/Clingstone/kaart.malaysiaNames.validator.mapcss

Last errors/warnings:
- 00285.091 E: https://a.mapillary.com/v3/organizations/O0K377md1CVrVkzGu4PV5z?client_id=UTZhSnNFdGpxSEFFREUwb01GYzlXZzpjNGViMzQxMTIzMjY0MjZm
- 00285.108 W: Region [userProfile_BLOCK_v2] : Problem verifying disk.
- 00285.247 E: java.io.IOException: stream is closed
- 00285.839 E: https://a.mapillary.com/v3/organizations/WWtFcTj2k8RnCLHxd2NQ2u?client_id=UTZhSnNFdGpxSEFFREUwb01GYzlXZzpjNGViMzQxMTIzMjY0MjZm
- 00286.029 E: java.io.IOException: stream is closed
- 01676.406 E: Handled by bug report queue: java.lang.NullPointerException
- 01685.145 W: Warning - <html>JOSM could not find information about the following plugins:<ul><li>auto_tools</li><li>apache-commons</li><li>rex</li><li>javafx-osx</li><li>Mapillary</li><li>graphview</li><li>changeset-viewer</li><li>osm-obj-info</li><li>reverter</li><li>continuosDownload</li><li>utilsplugin2</li><li>markseen</li><li>openqa</li><li>buildings_tools</li><li>jna</li><li>apache-http</li></ul>The plugins are not going to be loaded.</html>


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

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-2 (46) of javawsApplicationThreadGroup
java.lang.NullPointerException
	at org.glassfish.json.JsonObjectBuilderImpl$JsonObjectImpl.getString(JsonObjectBuilderImpl.java:257)
	at org.openstreetmap.josm.plugins.changeset.util.DataSetChangesetBuilder.processRelationPoint(DataSetChangesetBuilder.java:238)
	at org.openstreetmap.josm.plugins.changeset.util.DataSetChangesetBuilder.buildRelation(DataSetChangesetBuilder.java:227)
	at org.openstreetmap.josm.plugins.changeset.util.DataSetChangesetBuilder.build(DataSetChangesetBuilder.java:89)
	at org.openstreetmap.josm.plugins.changeset.util.ChangesetController.getChangeset(ChangesetController.java:30)
	at org.openstreetmap.josm.plugins.changeset.ChangesetDialog.printMap(ChangesetDialog.java:156)
	at org.openstreetmap.josm.plugins.changeset.ChangesetDialog$1.actionPerformed(ChangesetDialog.java:111)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
	at java.awt.Component.processMouseEvent(Component.java:6539)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
	at java.awt.Component.processEvent(Component.java:6304)
	at java.awt.Container.processEvent(Container.java:2239)
	at java.awt.Component.dispatchEventImpl(Component.java:4889)
	at java.awt.Container.dispatchEventImpl(Container.java:2297)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4904)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4535)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4476)
	at java.awt.Container.dispatchEventImpl(Container.java:2283)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
	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:74)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
	at java.awt.EventQueue$4.run(EventQueue.java:733)
	at java.awt.EventQueue$4.run(EventQueue.java:731)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
	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)