Exception when using tracer plugin

[anonymous]

I was tracing buildings using Tracer plugin (Press T and then just move around and click on the map)

This exception seem to happen quite often - perhaps some race condition in the redrawing code?

Build-Date: 2011-02-05 15:21:59
Revision: 3852
Is-Local-Build: true

Identification: JOSM/1.5 (3852 SVN en)
Memory Usage: 752 MB / 752 MB (532 MB allocated, but free)
Java version: 1.6.0_22, Sun Microsystems Inc., Java HotSpot(TM) 64-Bit Server VM
Operating system: Linux
Dataset consistency test: No problems found

Plugin: SimplifyArea (25192)
Plugin: buildings_tools (25192)
Plugin: download_along (25190)
Plugin: graphview (25199)
Plugin: lakewalker (25192)
Plugin: measurement (25137)
Plugin: openstreetbugs (23747)
Plugin: reverter (25190)
Plugin: terracer2 (${version.entry.commit.revision})
Plugin: tracer (25191)
Plugin: undelete (25199)
Plugin: waydownloader (25190)

java.lang.NullPointerException

at javax.swing.BufferStrategyPaintManager.flushAccumulatedRegion(BufferStrategyPaintManager.java:399)
at javax.swing.BufferStrategyPaintManager.endPaint(BufferStrategyPaintManager.java:363)
at javax.swing.RepaintManager.endPaint(RepaintManager.java:1288)
at javax.swing.JComponent._paintImmediately(JComponent.java:5078)
at javax.swing.JComponent.paintImmediately(JComponent.java:4882)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:785)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:713)
at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:693)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:125)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
at java.awt.Dialog$1.run(Dialog.java:1046)
at java.awt.Dialog$3.run(Dialog.java:1098)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1096)
at java.awt.Component.show(Component.java:1563)
at java.awt.Component.setVisible(Component.java:1515)
at java.awt.Window.setVisible(Window.java:842)
at java.awt.Dialog.setVisible(Dialog.java:986)
at org.openstreetmap.josm.gui.progress.PleaseWaitProgressMonitor$3.run(PleaseWaitProgressMonitor.java:83)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)