id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
19838	you have encountered a bug in JOSM	anonymous	team	"==== What steps will reproduce the problem?
1. just starting JOSM and the message appeared
2. 
3. 

==== 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: 2020-09-06 16:54:59 +0200 (Sun, 06 Sep 2020)
Build-Date:2020-09-07 01:30:48
Revision:17013
Relative:URL: ^/trunk

Identification: JOSM/1.5 (17013 en_GB) Windows 10 32-Bit
OS Build number: Windows 10 Home 1909 (18363)
Memory Usage: 247 MB / 989 MB (178 MB allocated, but free)
Java version: 1.8.0_261-b12, Oracle Corporation, Java HotSpot(TM) Client 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

Plugins:
+ HouseNumberTaggingTool
+ ImproveWay
+ Mapillary
+ apache-commons
+ apache-http
+ buildings_tools
+ imagery_offset_db
+ javafx-windows (35458)
+ jna
+ photo_geotagging
+ terracer
+ turnrestrictions
+ utilsplugin2

Last errors/warnings:
- 00016.078 E: Handled by bug report queue: org.openstreetmap.josm.tools.JosmRuntimeException: java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: Cannot modify the id counter backwards. Cause: java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: Cannot modify the id counter backwards. Cause: java.lang.IllegalArgumentException: Cannot modify the id counter backwards


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

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: main (1)
org.openstreetmap.josm.tools.JosmRuntimeException: java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: Cannot modify the id counter backwards
	at org.openstreetmap.josm.spi.lifecycle.Lifecycle.initialize(Lifecycle.java:89)
	at org.openstreetmap.josm.gui.MainApplication.mainJOSM(MainApplication.java:919)
	at org.openstreetmap.josm.gui.MainApplication$3.processArguments(MainApplication.java:277)
	at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:714)
Caused by: java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: Cannot modify the id counter backwards
	at java.util.concurrent.FutureTask.report(Unknown Source)
	at java.util.concurrent.FutureTask.get(Unknown Source)
	at org.openstreetmap.josm.spi.lifecycle.Lifecycle.initialize(Lifecycle.java:78)
	... 3 more
Caused by: java.lang.IllegalArgumentException: Cannot modify the id counter backwards
	at org.openstreetmap.josm.data.osm.UniqueIdGenerator.advanceUniqueId(UniqueIdGenerator.java:38)
	at org.openstreetmap.josm.io.AbstractReader.buildPrimitive(AbstractReader.java:627)
	at org.openstreetmap.josm.io.AbstractReader.addNode(AbstractReader.java:638)
	at org.openstreetmap.josm.io.AbstractReader.parseNode(AbstractReader.java:680)
	at org.openstreetmap.josm.io.OsmReader.parseNode(OsmReader.java:230)
	at org.openstreetmap.josm.io.OsmReader.parseOsm(OsmReader.java:169)
	at org.openstreetmap.josm.io.OsmReader.parseRoot(OsmReader.java:135)
	at org.openstreetmap.josm.io.OsmReader.parse(OsmReader.java:121)
	at org.openstreetmap.josm.io.OsmReader.lambda$doParseDataSet$0(OsmReader.java:491)
	at org.openstreetmap.josm.io.AbstractReader.doParseDataSet(AbstractReader.java:298)
	at org.openstreetmap.josm.io.OsmReader.doParseDataSet(OsmReader.java:488)
	at org.openstreetmap.josm.io.OsmReader.parseDataSet(OsmReader.java:538)
	at org.openstreetmap.josm.io.OsmReader.parseDataSet(OsmReader.java:521)
	at org.openstreetmap.josm.tools.Territories.initializeInternalData(Territories.java:137)
	at org.openstreetmap.josm.tools.Territories.initialize(Territories.java:123)
	at org.openstreetmap.josm.gui.MainInitialization.lambda$parallelInitializationTasks$6(MainInitialization.java:114)
	at org.openstreetmap.josm.spi.lifecycle.InitializationTask.call(InitializationTask.java:33)
	at org.openstreetmap.josm.spi.lifecycle.InitializationTask.call(InitializationTask.java:11)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
}}}
"	defect	closed	normal		Core		duplicate	template_report