Running the testcase attached to RT-14673

Press mouse on cell (0,0)
Press Shitf+Down Arrow four times.
Press Right Arrow three times (sometimes more, sometimes less).

You get a NPE :
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
        at com.sun.javafx.scene.control.behavior.TableViewBehavior.alsoSelectRightCell(TableViewBehavior.java:542)
        at com.sun.javafx.scene.control.behavior.TableViewBehavior.callAction(TableViewBehavior.java:151)
        at com.sun.javafx.scene.control.behavior.BehaviorBase.callActionForEvent(BehaviorBase.java:150)
        at com.sun.javafx.scene.control.behavior.TableViewBehavior.callActionForEvent(TableViewBehavior.java:182)
        at com.sun.javafx.scene.control.behavior.BehaviorBase$1.handle(BehaviorBase.java:112)
        at com.sun.javafx.scene.control.behavior.BehaviorBase$1.handle(BehaviorBase.java:110)
        at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:56)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:162)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:115)
        at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
        at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:47)
        at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33)
        at javafx.event.Event.fireEvent(Event.java:171)
        at javafx.scene.Scene$KeyHandler.process(Scene.java:2820)
        at javafx.scene.Scene$KeyHandler.access$1500(Scene.java:2750)
        at javafx.scene.Scene.impl_processKeyEvent(Scene.java:1351)
        at javafx.scene.Scene$ScenePeerListener.keyEvent(Scene.java:1783)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleKeyEvent(GlassViewEventHandler.java:108)
        at com.sun.glass.ui.View.handleKeyEvent(View.java:248)
        at com.sun.glass.ui.View.notifyKey(View.java:534)
JavaFX application launcher: calling System.exit
BUILD SUCCESSFUL (total time: 11 seconds)