NullpointerException while trying to fix overlap of forest and lake

[solgule]

What steps will reproduce the problem?

1. Search for small lake "Dalstjärnet".
2. Move around some nodes that are shared between lake and forest (south parts).
3. Maybe I had selected one or more of the polygones.

What is the expected result?

Tried to find out why the overlap occurs (I am beginner to editing multipologones with inner outer roles).

What happens instead?

Crashed.

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: 2017-05-29 16:19:58 +0200 (Mon, 29 May 2017)
Build-Date:2017-05-29 14:25:03
Revision:12275
Relative:URL: ^/trunk

Identification: JOSM/1.5 (12275 sv) Windows 7 64-Bit
OS Build number: Windows 7 Home Premium null (7601)
Memory Usage: 425 MB / 910 MB (243 MB allocated, but free)
Java version: 1.8.0_131-b11, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1920x1080
Maximum Screen Size: 1920x1080
Dataset consistency test: No problems found

Last errors/warnings:
- E: Handled by bug report queue: java.lang.NullPointerException


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

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-0 (18) of main
java.lang.NullPointerException
	at org.openstreetmap.josm.gui.NavigatableComponent.getBBox(NavigatableComponent.java:889)
	at org.openstreetmap.josm.gui.NavigatableComponent.getNearestWaySegmentsImpl(NavigatableComponent.java:1118)
	at org.openstreetmap.josm.gui.NavigatableComponent.getNearestWaySegment(NavigatableComponent.java:1229)
	at org.openstreetmap.josm.gui.NavigatableComponent.getNearestWaySegment(NavigatableComponent.java:1312)
	at org.openstreetmap.josm.actions.mapmode.DrawAction.tryToSetBaseSegmentForAngleSnap(DrawAction.java:787)
	at org.openstreetmap.josm.actions.mapmode.DrawAction.mouseReleased(DrawAction.java:387)
	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$500(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

[solgule]

The location of the small lake "Dalstjärnet" that was edited:

​http://www.openstreetmap.org/?mlat=59.5946&mlon=12.6520#map=16/59.5946/12.6520

[Don-vip]

In 12425/josm:

fix #14959 - NPE