FULL PRODUCT VERSION :
java version "1.8.0_65"
Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot(TM) Client VM (build 25.65-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
I'm using a TableView with getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE) and getSelectionModel().setCellSelectionEnabled(false) and was able to produce a NullPointerException by modifying the focus and selection with keyboard.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. select the 2nd row with a mouse click
2. press shift + up (modifies the selection)
3. press control + right (modifies the cell focus, cell focus is not visualized)
4. press shift + right (modifies the selection)


ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at com.sun.javafx.scene.control.behavior.TableViewBehaviorBase.updateCellHorizontalSelection(TableViewBehaviorBase.java:812)
at com.sun.javafx.scene.control.behavior.TableViewBehaviorBase.alsoSelectRightCell(TableViewBehaviorBase.java:690)
at com.sun.javafx.scene.control.behavior.TableViewBehaviorBase.callAction(TableViewBehaviorBase.java:171)
at com.sun.javafx.scene.control.behavior.BehaviorBase.callActionForEvent(BehaviorBase.java:218)
at com.sun.javafx.scene.control.behavior.TableViewBehaviorBase.callActionForEvent(TableViewBehaviorBase.java:208)
at com.sun.javafx.scene.control.behavior.BehaviorBase.lambda$new$74(BehaviorBase.java:135)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$KeyHandler.process(Scene.java:3964)
at javafx.scene.Scene$KeyHandler.access$1800(Scene.java:3910)
at javafx.scene.Scene.impl_processKeyEvent(Scene.java:2040)
at javafx.scene.Scene$ScenePeerListener.keyEvent(Scene.java:2501)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:197)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:147)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleKeyEvent$354(GlassViewEventHandler.java:228)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleKeyEvent(GlassViewEventHandler.java:227)
at com.sun.glass.ui.View.handleKeyEvent(View.java:546)
at com.sun.glass.ui.View.notifyKey(View.java:966)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$149(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.SelectionMode;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class TableViewExample extends Application {

    private void init(Stage primaryStage) {
        VBox root = new VBox(2);
        primaryStage.setScene(new Scene(root, 300, 300));

        final ObservableList<TableViewExample.Person> data = FXCollections.observableArrayList(
                new Person("Jacob", "Smith", "jacob.smith@example.com"),
                new TableViewExample.Person("Isabella", "Johnson", "isabella.johnson@example.com"),
                new TableViewExample.Person("Ethan", "Williams", "ethan.williams@example.com"),
                new TableViewExample.Person("Emma", "Jones", "emma.jones@example.com"),
                new TableViewExample.Person("Michael", "Brown", "michael.brown@example.com"),
                new TableViewExample.Person("Jacob", "Smith", "jacob.smith@example.com"),
                new TableViewExample.Person("Isabella", "Johnson", "isabella.johnson@example.com"),
                new TableViewExample.Person("Ethan", "Williams", "ethan.williams@example.com"),
                new TableViewExample.Person("Emma", "Jones", "emma.jones@example.com"),
                new TableViewExample.Person("Michael", "Brown", "michael.brown@example.com"),
                new TableViewExample.Person("Jacob", "Smith", "jacob.smith@example.com" ),
                new TableViewExample.Person("Isabella", "Johnson", "isabella.johnson@example.com" ),
                new TableViewExample.Person("Ethan", "Williams", "ethan.williams@example.com" ),
                new TableViewExample.Person("Emma", "Jones", "emma.jones@example.com" ),
                new TableViewExample.Person("Michael", "Brown", "michael.brown@example.com" ));

        TableColumn firstNameCol = new TableColumn();
        firstNameCol.setText("First");
        firstNameCol.setCellValueFactory(new PropertyValueFactory("firstName"));
        TableColumn lastNameCol = new TableColumn();
        lastNameCol.setText("Last");
        lastNameCol.setCellValueFactory(new PropertyValueFactory("lastName"));
        TableColumn emailCol = new TableColumn();
        emailCol.setText("Email");
        emailCol.setCellValueFactory(new PropertyValueFactory("email"));
        TableView tableView = new TableView();
        tableView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
        tableView.getSelectionModel().setCellSelectionEnabled(false);
        tableView.setItems(data);
        tableView.getColumns().clear();
        tableView.getColumns().addAll(firstNameCol, lastNameCol, emailCol);

        root.getChildren().addAll(tableView);
    }

    public static class Person {

        private StringProperty firstName;
        private StringProperty lastName;
        private StringProperty email;

        private Person(String fName, String lName, String email) {
            this.firstName = new SimpleStringProperty(fName);
            this.lastName = new SimpleStringProperty(lName);
            this.email = new SimpleStringProperty(email);
        }

        public StringProperty firstNameProperty() {
            return firstName;
        }

        public StringProperty lastNameProperty() {
            return lastName;
        }

        public StringProperty emailProperty() {
            return email;
        }
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        init(primaryStage);
        primaryStage.setTitle("Table Test " + System.getProperty("javafx.runtime.version"));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}
---------- END SOURCE ----------