NPE in josm.Main.exitJosm

[naoliv]

Sorry for opening 3 bug reports (this one, #12968 and #12969), but I don't know if they are all related.

While starting JOSM I saw this:

ERRO: java.lang.NullPointerException
java.lang.NullPointerException
	at org.openstreetmap.josm.Main.exitJosm(Main.java:1110)
	at org.openstreetmap.josm.actions.RestartAction.restartJOSM(RestartAction.java:85)
	at org.openstreetmap.josm.actions.RestartAction.actionPerformed(RestartAction.java:65)
	at org.openstreetmap.josm.gui.MainApplication$6.run(MainApplication.java:607)
	at java.lang.Thread.run(Thread.java:745)

JOSM

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-06-14 22:25:40 +0200 (Tue, 14 Jun 2016)
Build-Date:2016-06-15 01:34:12
Revision:10377
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10377 pt_BR) Linux Debian GNU/Linux testing (stretch)
Memory Usage: 247 MB / 10206 MB (141 MB allocated, but free)
Java version: 1.8.0_91-8u91-b14-2-b14, Oracle Corporation, OpenJDK 64-Bit Server VM
VM arguments: [-Dawt.useSystemAAFontSettings=on]

Plugins:
- Create_grid_of_ways (32158)
- DxfImport (1006)
- OpeningHoursEditor (32158)
- PicLayer (32158)
- RoadSigns (32177)
- SimplifyArea (32158)
- apache-commons (32158)
- buildings_tools (32158)
- conflation (0.2.0)
- contourmerge (1014)
- download_along (32158)
- editgpx (32263)
- ejml (32158)
- geotools (31895)
- imagery_offset_db (32158)
- importvec (32158)
- indoorhelper (32158)
- jts (31906)
- log4j (32158)
- measurement (32158)
- merge-overlap (32158)
- opendata (32158)
- pbf (32158)
- pdfimport (32158)
- poly (32158)
- reverter (32158)
- scripting (30723)
- todo (29154)
- turnrestrictions (32158)
- undelete (32158)
- utilsplugin2 (32158)

}}}

[Don-vip]

In 10387/josm:

fix #12970 - NPE in Main.exitJosm when a restart occurs during IPv6 check