DataIntegrityProblemException: Primitive cannot be modified in read-only dataset

[GerdP]

What steps will reproduce the problem?

1. Load attached locked file
2. run validator

What is the expected result?

no crash

What happens instead?

bug report

Please provide any additional information below. Attach a screenshot if possible.

regression from r16787, see #19180

Build-Date:2020-07-30 11:59:55
Revision:16809
Is-Local-Build:true

Identification: JOSM/1.5 (16809 SVN en) Windows 10 64-Bit
OS Build number: Windows 10 Home 1903 (18362)
Memory Usage: 671 MB / 1753 MB (443 MB allocated, but free)
Java version: 1.8.0_191-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920x1080 (scaling 1.0x1.0)
Maximum Screen Size: 1920x1080
Best cursor sizes: 16x16 -> 32x32, 32x32 -> 32x32
VM arguments: [-agentlib:jdwp=transport=dt_socket,suspend=y,address=localhost:56613, -ea, -Dfile.encoding=UTF-8]
Program arguments: [--debug]
Dataset consistency test: No problems found

Plugins:
+ OpeningHoursEditor (35414)
+ PolygonCutOut (v0.7)
+ apache-commons (35362)
+ buildings_tools (35500)
+ continuosDownload (91)
+ ejml (35313)
+ geotools (35169)
+ jaxb (35092)
+ jts (35122)
+ merge-overlap (35248)
+ o5m (35248)
+ opendata (35513)
+ pbf (35446)
+ poly (35248)
+ reverter (35499)
+ undelete (35499)
+ utilsplugin2 (35487)

Last errors/warnings:
- E: java.lang.IllegalArgumentException: Parameter 'data' must not be null
- E: Handled by bug report queue: org.openstreetmap.josm.data.osm.DataIntegrityProblemException: Primitive cannot be modified in read-only dataset: {Node id=-107737 version=0 MVT lat=44.52595620359,lon=-80.25662705987}


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

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-0 (21) of main
org.openstreetmap.josm.data.osm.DataIntegrityProblemException: Primitive cannot be modified in read-only dataset: {Node id=-107737 version=0 MVT lat=44.52595620359,lon=-80.25662705987}
	at org.openstreetmap.josm.data.osm.OsmPrimitive.checkDatasetNotReadOnly(OsmPrimitive.java:208)
	at org.openstreetmap.josm.data.osm.OsmPrimitive.put(OsmPrimitive.java:644)
	at org.openstreetmap.josm.data.validation.tests.TagChecker.filterDeprecatedTags(TagChecker.java:979)
	at org.openstreetmap.josm.data.validation.tests.TagChecker.tryGuess(TagChecker.java:924)
	at org.openstreetmap.josm.data.validation.tests.TagChecker.checkSingleTagComplex(TagChecker.java:841)
	at org.openstreetmap.josm.data.validation.tests.TagChecker.check(TagChecker.java:623)
	at org.openstreetmap.josm.data.validation.Test$TagTest.visit(Test.java:129)
	at org.openstreetmap.josm.data.osm.Node.accept(Node.java:210)
	at org.openstreetmap.josm.data.validation.Test.visit(Test.java:216)
	at org.openstreetmap.josm.data.validation.tests.TagChecker.visit(TagChecker.java:1053)
	at org.openstreetmap.josm.actions.ValidateAction$ValidationTask.realRun(ValidateAction.java:169)
	at org.openstreetmap.josm.gui.PleaseWaitRunnable.doRealRun(PleaseWaitRunnable.java:94)
	at org.openstreetmap.josm.gui.PleaseWaitRunnable.run(PleaseWaitRunnable.java:142)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

[GerdP]

locked file with node tagged highway=fard