java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.sun.javafx.scene.web.skin.HTMLEditorSkin.executeCommand(HTMLEditorSkin.java:897)
at com.sun.javafx.scene.web.skin.HTMLEditorSkin.access$800(HTMLEditorSkin.java:55)
at com.sun.javafx.scene.web.skin.HTMLEditorSkin$13.changed(HTMLEditorSkin.java:551)
at com.sun.javafx.scene.web.skin.HTMLEditorSkin$13.changed(HTMLEditorSkin.java:543)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:181)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:64)
at javafx.beans.property.ReadOnlyObjectWrapper$ReadOnlyPropertyImpl.fireValueChangedEvent(ReadOnlyObjectWrapper.java:154)
at javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:120)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:89)
at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:122)
at javafx.scene.control.ToggleGroup$2.set(ToggleGroup.java:75)
at javafx.scene.control.ToggleGroup$2.set(ToggleGroup.java:60)
at javafx.scene.control.ToggleGroup.selectToggle(ToggleGroup.java:87)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:88)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:122)
at com.sun.javafx.scene.web.skin.HTMLEditorSkin$12.run(HTMLEditorSkin.java:533)
at com.sun.javafx.application.PlatformImpl$3.run(PlatformImpl.java:108)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
at com.sun.glass.ui.win.WinApplication$2$1.run(WinApplication.java:62)
at java.lang.Thread.run(Thread.java:722)

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