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Exception in thread "AWT-EventQueue-1" (06:42:44) java.util.ConcurrentModificationException
(06:42:44)     at java.util.ArrayDeque$DeqIterator.next(Unknown Source)
(06:42:44)     at a.sP.render(xtb:86)
(06:42:44)     at a.wJ.paintComponent(qhb:211)
(06:42:44)     at javax.swing.JComponent.paint(Unknown Source)
(06:42:44)     at javax.swing.JComponent.paintChildren(Unknown Source)
(06:42:44)     at javax.swing.JComponent.paint(Unknown Source)
(06:42:44)     at javax.swing.JLayeredPane.paint(Unknown Source)
(06:42:44)     at javax.swing.JComponent.paintChildren(Unknown Source)
(06:42:44)     at javax.swing.JComponent.paintToOffscreen(Unknown Source)
(06:42:44)     at javax.swing.RepaintManager.paint(Unknown Source)
(06:42:44)     at javax.swing.JComponent.paint(Unknown Source)
(06:42:44)     at java.awt.GraphicsCallback$PaintCallback.run(Unknown Source)
(06:42:44)     at sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)
(06:42:44)     at sun.awt.SunGraphicsCallback.runComponents(Unknown Source)
(06:42:44)     at java.awt.Container.paint(Unknown Source)
(06:42:44)     at java.awt.Window.paint(Unknown Source)
(06:42:44)     at javax.swing.RepaintManager$3.run(Unknown Source)
(06:42:44)     at javax.swing.RepaintManager$3.run(Unknown Source)
(06:42:44)     at java.security.AccessController.doPrivileged(Native Method)
(06:42:44)     at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
(06:42:44)     at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
(06:42:44)     at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
(06:42:44)     at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
(06:42:44)     at javax.swing.RepaintManager.access$1100(Unknown Source)
(06:42:44)     at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
(06:42:44)     at java.awt.event.InvocationEvent.dispatch(Unknown Source)
(06:42:44)     at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
(06:42:44)     at java.awt.EventQueue.access$400(Unknown Source)
(06:42:44)     at java.awt.EventQueue$3.run(Unknown Source)
(06:42:44)     at java.awt.EventQueue$3.run(Unknown Source)
(06:42:44)     at java.security.AccessController.doPrivileged(Native Method)
(06:42:44)     at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
(06:42:44)     at java.awt.EventQueue.dispatchEvent(Unknown Source)
(06:42:44)     at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
(06:42:44)     at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
(06:42:44)     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
(06:42:44)     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
(06:42:44)     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
(06:42:44)     at java.awt.EventDispatchThread.run(Unknown Source)

It is a rare error, but I don't think it is my fault

 

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It's fixed for the next release and is a result of something I changed in the last release.