#33 NullPointerException while docking pane is not yet visible

[Sir Mad]

Preface: I am using the docking framework V1.6.1

While my application startup, i see a sporadic NPE. Do you know the reason for this?

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.ArrayTable.remove(ArrayTable.java:188)
at javax.swing.InputMap.remove(InputMap.java:121)
at javax.swing.ToolTipManager.unregisterComponent(ToolTipManager.java:395)
at javax.swing.JComponent.setToolTipText(JComponent.java:2965)
at net.infonode.docking.internalutil.InternalDockingUtil.updateButtons(Unknown Source)
at net.infonode.docking.WindowTab.updateTabButtons(Unknown Source)
at net.infonode.docking.DockingWindow.updateButtonVisibility(Unknown Source)
at net.infonode.docking.View.updateButtonVisibility(Unknown Source)
at net.infonode.docking.DockingWindow.updateButtonVisibility(Unknown Source)
at net.infonode.docking.TabWindow.doUpdateButtonVisibility(Unknown Source)
at net.infonode.docking.TabWindow.updateButtonVisibility(Unknown Source)
at net.infonode.docking.AbstractTabWindow$6.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)