Unknown error upon save on close

[canyonbuilders@…]

What steps will reproduce the problem?

What is the expected result?

What happens instead?

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

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-08-02 19:44:04 +0200 (Mon, 02 Aug 2021)
Build-Date:2021-08-02 18:26:20
Revision:18118
Relative:URL: ^/trunk

Identification: JOSM/1.5 (18118 en) Windows 10 64-Bit
OS Build number: Windows 10 Home 2009 (19043)
Memory Usage: 247 MB / 247 MB (36 MB allocated, but free)
Java version: 1.8.0_261-b12, Oracle Corporation, Java HotSpot(TM) Client VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1600×900 (scaling 1.00×1.00)
Maximum Screen Size: 1600×900
Best cursor sizes: 16×16→32×32, 32×32→32×32
System property file.encoding: Cp1252
System property sun.jnu.encoding: Cp1252
Locale info: en_US
Numbers with default locale: 1234567890 -> 1234567890
Dataset consistency test: No problems found

Last errors/warnings:
- 97367.009 E: Failed to locate image 'https://gisdata.mn.gov/agencyLogos/mnLogo.jpg'
- 97370.543 E: Unsupported savable layer type: TMSLayer
- 97884.574 W: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target. Cause: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target. Cause: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
- 97884.574 W: Already here sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
- 97884.671 E: Failed to locate image 'https://gisdata.mn.gov/agencyLogos/mnLogo.jpg'
- 97889.983 E: Unsupported savable layer type: TMSLayer
- 98455.339 W: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target. Cause: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target. Cause: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
- 98455.339 W: Already here sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
- 98455.444 E: Failed to locate image 'https://gisdata.mn.gov/agencyLogos/mnLogo.jpg'
- 102036.898 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 (19) of main
java.lang.NullPointerException
	at org.openstreetmap.josm.io.GpxWriter.write(GpxWriter.java:87)
	at org.openstreetmap.josm.io.GpxWriter.write(GpxWriter.java:73)
	at org.openstreetmap.josm.io.session.GpxTracksSessionExporter.addDataFile(GpxTracksSessionExporter.java:36)
	at org.openstreetmap.josm.io.session.GenericSessionExporter.export(GenericSessionExporter.java:193)
	at org.openstreetmap.josm.io.session.SessionWriter.createJosDocument(SessionWriter.java:236)
	at org.openstreetmap.josm.io.session.SessionWriter.write(SessionWriter.java:351)
	at org.openstreetmap.josm.io.session.SessionWriter.write(SessionWriter.java:338)
	at org.openstreetmap.josm.actions.SessionSaveAsAction.saveSession(SessionSaveAsAction.java:167)
	at org.openstreetmap.josm.gui.io.SaveLayersDialog$SaveSessionAction.actionPerformed(SaveLayersDialog.java:444)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	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.pumpEventsForFilter(Unknown Source)
	at java.awt.WaitDispatchSupport$2.run(Unknown Source)
	at java.awt.WaitDispatchSupport$4.run(Unknown Source)
	at java.awt.WaitDispatchSupport$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.awt.WaitDispatchSupport.enter(Unknown Source)
	at java.awt.Dialog.show(Unknown Source)
	at java.awt.Component.show(Unknown Source)
	at java.awt.Component.setVisible(Unknown Source)
	at java.awt.Window.setVisible(Unknown Source)
	at java.awt.Dialog.setVisible(Unknown Source)
	at org.openstreetmap.josm.gui.io.SaveLayersDialog.saveUnsavedModifications(SaveLayersDialog.java:130)
	at org.openstreetmap.josm.gui.MainApplication.lambda$exitJosm$3(MainApplication.java:517)
	at org.openstreetmap.josm.gui.util.GuiHelper.runInEDTAndWaitAndReturn(GuiHelper.java:268)
	at org.openstreetmap.josm.gui.MainApplication.exitJosm(MainApplication.java:516)
	at org.openstreetmap.josm.gui.MainFrame$ExitWindowAdapter.windowClosing(MainFrame.java:198)
	at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
	at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
	at java.awt.AWTEventMulticaster.windowClosing(Unknown Source)
	at java.awt.Window.processWindowEvent(Unknown Source)
	at javax.swing.JFrame.processWindowEvent(Unknown Source)
	at java.awt.Window.processEvent(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.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)