NPE with keyboard shortcut

java.lang.NullPointerException
	at org.netbeans.core.multiview.TabsComponent.peerClearSplit(TabsComponent.java:191)
	at org.netbeans.core.multiview.MultiViewPeer.peerClearSplit(MultiViewPeer.java:389)
	at org.netbeans.core.multiview.MultiViewCloneableTopComponent.clearSplit(MultiViewCloneableTopComponent.java:227)
	at org.netbeans.core.multiview.SplitAction.clearSplit(SplitAction.java:215)
	at org.netbeans.core.multiview.ClearSplitAction.actionPerformed(ClearSplitAction.java:59)
	at org.openide.awt.AlwaysEnabledAction$1.run(AlwaysEnabledAction.java:174)
	at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:70)
	at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:91)
	at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:74)
	at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:177)
	at org.openide.windows.TopComponent.processKeyBinding(TopComponent.java:1151)
	at java.desktop/javax.swing.JComponent.processKeyBindings(JComponent.java:2962)
	at java.desktop/javax.swing.JComponent.processKeyEvent(JComponent.java:2862)
	at java.desktop/java.awt.Component.processEvent(Component.java:6366)
	at java.desktop/java.awt.Container.processEvent(Container.java:2261)
	at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4966)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2319)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4798)
	at java.desktop/java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1950)
	at java.desktop/java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:871)
	at java.desktop/java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1140)
	at java.desktop/java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:1010)
	at java.desktop/java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:836)
	at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4847)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2319)
	at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4798)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
	at java.desktop/java.awt.EventQueue.access$600(EventQueue.java:97)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:136)
[catch] at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)