Moxkiriya7

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Page編集画面でAdd new categoryボタンを押下し、新しいカテゴリを追加した際、NullPointerExceptionが発生する。

以下はExceptionのstackTraceです。

java.lang.NullPointerException
	at com.wiki.standalone.moxkiriya.WikiMainWindowController.setCategory(WikiMainWindowController.java:561)
	at com.wiki.standalone.moxkiriya.WikiMainWindowController.onActionButtonAddNewCategory(WikiMainWindowController.java:435)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:75)
	at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:279)
	at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1451)
	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:69)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170)
	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.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:28)
	at javafx.event.Event.fireEvent(Event.java:171)
	at javafx.scene.Node.fireEvent(Node.java:6866)
	at javafx.scene.control.Button.fire(Button.java:179)
	at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:193)
	at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:336)
	at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:329)
	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:64)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170)
	at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33)
	at javafx.event.Event.fireEvent(Event.java:171)
	at javafx.scene.Scene$MouseHandler.process(Scene.java:3369)
	at javafx.scene.Scene$MouseHandler.process(Scene.java:3209)
	at javafx.scene.Scene$MouseHandler.access$1900(Scene.java:3164)
	at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1582)
	at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2267)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:250)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:173)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:292)
	at com.sun.glass.ui.View.handleMouseEvent(View.java:530)
	at com.sun.glass.ui.View.notifyMouse(View.java:924)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:17)
	at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:67)
	at java.lang.Thread.run(Thread.java:745)