NullPointerException in Navigator

dbvis 6.0.7

got an error wile playing around in navigator:

java.lang.NullPointerException
    at com.onseven.dbvis.Y.F.equals(Z:1715)
    at java.util.ArrayList.indexOf(ArrayList.java:220)
    at java.util.ArrayList.contains(ArrayList.java:201)
    at java.util.AbstractCollection.removeAll(AbstractCollection.java:353)
    at com.onseven.dbvis.Y.A.ā(Z:3487)
    at com.onseven.dbvis.Y.E$1.actionPerformed(Z:2551)
    at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1197)
    at javax.swing.JComboBox.setSelectedItem(JComboBox.java:561)
    at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:597)
    at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(BasicComboPopup.java:808)
    at javax.swing.plaf.basic.BasicComboPopup$ListMouseHandler.mouseReleased(BasicComboPopup.java:717)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:232)
    at java.awt.Component.processMouseEvent(Component.java:5501)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)
    at javax.swing.plaf.basic.BasicComboPopup$1.processMouseEvent(BasicComboPopup.java:476)
    at java.awt.Component.processEvent(Component.java:5266)
    at java.awt.Container.processEvent(Container.java:1966)
    at java.awt.Component.dispatchEventImpl(Component.java:3968)
    at java.awt.Container.dispatchEventImpl(Container.java:2024)
    at java.awt.Component.dispatchEvent(Component.java:3803)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
    at java.awt.Container.dispatchEventImpl(Container.java:2010)
    at java.awt.Window.dispatchEventImpl(Window.java:1778)
    at java.awt.Component.dispatchEvent(Component.java:3803)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
    at com.onseven.dbvis.I.A.f.dispatchEvent(Z:2787)
    at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

Hi Thomas, I'm able to reproduce this error. It happens when a FK column has a null value. It will be fixed in the next version. Thanks for reporting it, Hans