error when using gpx audio file

[heehooman+josm@…]

What steps will reproduce the problem?

1. Open a GPX file.
2. Right-click the GPX layer and select "Import audio", and open a time-synced WAV file.
3. Do something (e.g. playing, "sync audio") which uses the audio file data

What is the expected result?
usual

What happens instead?
error

Please provide any additional information below. Attach a screenshot if
possible.

Even though this bug was reported with latest available version, it occurs with older versions too. Perhaps it is due to the configuration used somehow?

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2014-07-13 01:35:29
Last Changed Author: akks
Revision: 7309
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2014-07-12 20:45:45 +0200 (Sat, 12 Jul 2014)
Last Changed Rev: 7309

Identification: JOSM/1.5 (7309 en) Linux Debian GNU/Linux testing (jessie)
Memory Usage: 325 MB / 670 MB (126 MB allocated, but free)
Java version: 1.7.0_60, Oracle Corporation, OpenJDK 64-Bit Server VM
Java package: openjdk-7-jre:amd64-7u60-2.5.0-2
Dataset consistency test: No problems found

Plugin: CommandLine (30436)
Plugin: DirectDownload (30416)
Plugin: ElevationProfile (30416)
Plugin: editgpx (30416)
Plugin: gpxfilter (30416)
Plugin: graphview (30416)
Plugin: imagery_offset_db (30416)
Plugin: lakewalker (30416)
Plugin: livegps (30506)
Plugin: measurement (30416)
Plugin: openvisible (30416)
Plugin: pdfimport (30416)
Plugin: photo_geotagging (30462)
Plugin: turnlanes (30416)
Plugin: turnrestrictions (30454)
Plugin: undelete (30416)

java.lang.NullPointerException
	at org.openstreetmap.josm.gui.layer.markerlayer.MarkerLayer$SynchronizeAudio.actionPerformed(MarkerLayer.java:516)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877)
	at java.awt.Component.processMouseEvent(Component.java:6516)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3311)
	at java.awt.Component.processEvent(Component.java:6281)
	at java.awt.Container.processEvent(Container.java:2229)
	at java.awt.Component.dispatchEventImpl(Component.java:4872)
	at java.awt.Container.dispatchEventImpl(Container.java:2287)
	at java.awt.Component.dispatchEvent(Component.java:4698)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
	at java.awt.Container.dispatchEventImpl(Container.java:2273)
	at java.awt.Window.dispatchEventImpl(Window.java:2719)
	at java.awt.Component.dispatchEvent(Component.java:4698)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
	at java.awt.EventQueue.access$200(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:694)
	at java.awt.EventQueue$3.run(EventQueue.java:692)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.awt.EventQueue$4.run(EventQueue.java:708)
	at java.awt.EventQueue$4.run(EventQueue.java:706)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

[Don-vip]

In 7310/josm:

fix #10266 - fix issue with audio marker synchronisation