java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at javax.swing.LayoutComparator.compare(Unknown Source)
at java.util.Collections.indexedBinarySearch(Unknown Source)
at java.util.Collections.binarySearch(Unknown Source)
at javax.swing.SortingFocusTraversalPolicy.getComponentAfter(UnknownSource)
at javax.swing.LayoutFocusTraversalPolicy.getComponentAfter(UnknownSource)
at java.awt.Component.nextFocusHelper(Unknown Source)
at java.awt.Container.nextFocusHelper(Unknown Source)
at java.awt.Component.nextFocus(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.processFocusEvent(Unknown Source)
at oracle.ewt.lwAWT.AbstractButton.processFocusEvent(Unknown Source)
at oracle.ewt.button.PushButton.processFocusEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.processEventImpl(Unknown Source)
at oracle.ewt.button.PushButton.processEventImpl(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)

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