Error after running slime for a while

[qiemem]

java.util.ConcurrentModificationException
 at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
 at java.util.AbstractList$Itr.next(AbstractList.java:343)
 at view25d.view.gl.PatchGL.display(PatchGL.java:250)
 at com.sun.opengl.impl.GLDrawableHelper.display(GLDrawableHelper.java:78)
 at javax.media.opengl.GLCanvas$DisplayAction.run(GLCanvas.java:435)
 at com.sun.opengl.impl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:194)
 at javax.media.opengl.GLCanvas.maybeDoSingleThreadedWorkaround(GLCanvas.java:412)
 at javax.media.opengl.GLCanvas.display(GLCanvas.java:244)
 at javax.media.opengl.GLCanvas.paint(GLCanvas.java:277)
 at javax.media.opengl.GLCanvas.update(GLCanvas.java:354)
 at sun.awt.RepaintArea.updateComponent(RepaintArea.java:267)
 at sun.awt.RepaintArea.paint(RepaintArea.java:233)
 at apple.awt.ComponentModel.handleEvent(ComponentModel.java:263)
 at java.awt.Component.dispatchEventImpl(Component.java:4852)
 at java.awt.Component.dispatchEvent(Component.java:4604)
 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:717)
 at java.awt.EventQueue.access$400(EventQueue.java:82)
 at java.awt.EventQueue$2.run(EventQueue.java:676)
 at java.awt.EventQueue$2.run(EventQueue.java:674)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
 at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:97)
 at java.awt.EventQueue$3.run(EventQueue.java:690)
 at java.awt.EventQueue$3.run(EventQueue.java:688)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:687)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

I suspect this is a timing bug that will be hard to reproduce. I had messed around with the view (just mouse manipulation, not code), but wasn't when the error occurred.