null pointer exception iin PT_assistant

[Polyglot]

What steps will reproduce the problem?

1. I opened the relation editor on route 179 (to close a gap)

What is the expected result?

What happens instead?

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: 2016-06-27 00:22:39 +0200 (Mon, 27 Jun 2016)
Build-Date:2016-06-27 01:32:19
Revision:10497
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10497 en) Windows 7 64-Bit
Memory Usage: 1333 MB / 2889 MB (980 MB allocated, but free)
Java version: 1.8.0_91-b14, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Dataset consistency test: No problems found

Plugins:
- CustomizePublicTransportStop (0.2)
- Mapillary (32396)
- OpeningHoursEditor (32158)
- RoadSigns (32177)
- apache-commons (32158)
- apache-http (32158)
- buildings_tools (32158)
- geochat (32158)
- livegps (32158)
- measurement (32324)
- pt_assistant (32477)
- reverter (32158)
- scripting (30723)
- surveyor (32158)
- tag2link (31923)
- terracer (32158)
- todo (29154)
- tofix (1466522948)
- turnrestrictions (32386)
- undelete (32158)
- utilsplugin2 (32158)
- wikipedia (32182)

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/PTStops&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransport&zip=1

Last errors/warnings:
- W: Old style SideButton usage for action org.wikipedia.WikipediaToggleDialog$WikipediaLoadCategoryAction@1fc5c1c6
- W: Old style SideButton usage for action org.wikipedia.WikipediaToggleDialog$PasteWikipediaArticlesAction@23873e58
- W: Old style SideButton usage for action org.wikipedia.WikipediaToggleDialog$AddWikipediaTagAction@6580cd87
- W: Old style SideButton usage for action org.wikipedia.WikipediaToggleDialog$WikipediaSettingsAction@3d80e912
- E: java.lang.NullPointerException

java.lang.NullPointerException
	at org.openstreetmap.josm.plugins.pt_assistant.gui.PTAssistantLayer.propertyChange(PTAssistantLayer.java:166)
	at java.beans.PropertyChangeSupport.fire(Unknown Source)
	at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
	at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
	at java.awt.KeyboardFocusManager.firePropertyChange(Unknown Source)
	at java.awt.KeyboardFocusManager.setGlobalFocusedWindow(Unknown Source)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(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.SequencedEvent.dispatch(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)

[Polyglot]

PT in Belgium