IAE: Primitive to delete must be in a dataset

[adam.step@…]

What steps will reproduce the problem?

1. run OSM trace server
2. use Czech CUZK.KM as layer
3. trace two buildings that are adjacent next to each other

What is the expected result?

draw buildings

What happens instead?

the second buildings corrupts the tool

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: 2017-04-02 01:45:00 +0200 (Sun, 02 Apr 2017)
Build-Date:2017-04-02 01:34:50
Revision:11826
Relative:URL: ^/trunk

Identification: JOSM/1.5 (11826 en) Windows 8.1 64-Bit
Memory Usage: 989 MB / 989 MB (59 MB allocated, but free)
Java version: 1.8.0_111-b14, Oracle Corporation, Java HotSpot(TM) Client VM
Screen: \Display0 1920x1080, \Display1 1280x1024
Maximum Screen Size: 1920x1080
Dataset consistency test: No problems found

Plugins:
+ FixAddresses (33182)
+ Tracer (33004)
+ czechaddress (33033)
+ ejml (32680)
+ geotools (33042)
+ jts (32699)
+ turnrestrictions (33088)

Last errors/warnings:
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- E: Handled by bug report queue: java.lang.IllegalArgumentException: Primitive to delete must be in a dataset
- E: Handled by bug report queue: java.lang.IllegalArgumentException: Primitive to delete must be in a dataset
- E: Handled by bug report queue: java.lang.IllegalArgumentException: Primitive to delete must be in a dataset
- E: Handled by bug report queue: java.lang.IllegalArgumentException: Primitive to delete must be in a dataset


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

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-0 (18) of main
java.lang.IllegalArgumentException: Primitive to delete must be in a dataset
	at org.openstreetmap.josm.command.DeleteCommand.checkConsistency(DeleteCommand.java:163)
	at org.openstreetmap.josm.command.DeleteCommand.<init>(DeleteCommand.java:96)
	at org.openstreetmap.josm.command.DeleteCommand.<init>(DeleteCommand.java:106)
	at org.openstreetmap.josm.plugins.tracer.ConnectWays.mergeNodes(ConnectWays.java:108)
	at org.openstreetmap.josm.plugins.tracer.ConnectWays.connect(ConnectWays.java:72)
	at org.openstreetmap.josm.plugins.tracer.TracerAction.traceSync(TracerAction.java:132)
	at org.openstreetmap.josm.plugins.tracer.TracerAction.access$000(TracerAction.java:34)
	at org.openstreetmap.josm.plugins.tracer.TracerAction$1.realRun(TracerAction.java:79)
	at org.openstreetmap.josm.gui.PleaseWaitRunnable.doRealRun(PleaseWaitRunnable.java:95)
	at org.openstreetmap.josm.gui.PleaseWaitRunnable.run(PleaseWaitRunnable.java:143)
	at java.lang.Thread.run(Unknown Source)