NPE 9.0.7

I tried to open the sql history. Did cancel some actions before that. Also had some pl/sql error's before the error occurred. Not clear how to reproduce but it happened before. An internal error occurred in: java.lang.IllegalArgumentException: DockableFrame object-view doesn't exist The error may have affected the application state. Please notify vendor. Stack Trace: java.lang.IllegalArgumentException: DockableFrame object-view doesn't exist    at com.jidesoft.docking.DefaultDockingManager.moveFrame(Unknown Source)    at com.onseven.dbvis.j.A.E.ă(Z:567)    at com.onseven.dbvis.A.ם(Z:3336)    at com.onseven.dbvis.A$46.execute(Z:3382)    at se.pureit.swing.R.F.actionPerformed(Z:2594)    at javax.swing.SwingUtilities.notifyAction(Unknown Source)    at javax.swing.JComponent.processKeyBinding(Unknown Source)    at javax.swing.JMenuBar.processKeyBinding(Unknown Source)    at javax.swing.KeyboardManager.fireBinding(Unknown Source)    at javax.swing.KeyboardManager.fireKeyboardAction(Unknown Source)    at javax.swing.JComponent.processKeyBindingsForAllComponents(Unknown Source)    at javax.swing.SwingUtilities.processKeyBindings(Unknown Source)    at javax.swing.UIManager$2.postProcessKeyEvent(Unknown Source)    at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)    at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)    at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)    at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)    at java.awt.Component.dispatchEventImpl(Unknown Source)    at java.awt.Container.dispatchEventImpl(Unknown Source)    at java.awt.Window.dispatchEventImpl(Unknown Source)    at java.awt.Component.dispatchEvent(Unknown Source)    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)    at java.awt.EventQueue.access$400(Unknown Source)    at java.awt.EventQueue$2.run(Unknown Source)    at java.awt.EventQueue$2.run(Unknown Source)    at java.security.AccessController.doPrivileged(Native Method)    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)    at java.awt.EventQueue$3.run(Unknown Source)    at java.awt.EventQueue$3.run(Unknown Source)    at java.security.AccessController.doPrivileged(Native Method)    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)    at java.awt.EventQueue.dispatchEvent(Unknown Source)    at com.onseven.dbvis.N.A._.dispatchEvent(Z:483)    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)    at java.awt.EventDispatchThread.run(Unknown Source) System Information: Product: DbVisualizer Pro 9.0.7 Build: #1935 (2013/06/04 10:02) Java VM: Java HotSpot(TM) 64-Bit Server VM Java Version: 1.6.0_43 Java Vendor: Sun Microsystems Inc. OS Name: Windows 7 OS Arch: amd64 OS Version: 6.1