-fx-pref-tile-width causes ClassCastException

The following style class is defined in a style sheet:

.tile-pane {
    -fx-pref-tile-height: 74.0;
    -fx-pref-tile-width: 67.0;
    -fx-tile-alignment: bottom-center;
}

In the code, the style is added to a tile pane:

        TilePane tiles = new TilePane();
        tiles.getStyleClass().add("tile-pane");

When the code is executed the following warning is received. If the -fx-pref-tile-width is removed, the warning is not received.

WARNING: com.sun.javafx.css.StyleHelper transitionToState Failed to set css [StyleableProperty {property: -fx-pref-tile-width, converter: SizeConverter, initalValue: -1.0, inherits: false, subProperties: []}]

java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Integer
at com.sun.javafx.css.StyleableIntegerProperty.applyStyle(Unknown Source)
at com.sun.javafx.css.StyleableProperty.set(Unknown Source)
at com.sun.javafx.css.StyleHelper.transitionToState(Unknown Source)
at javafx.scene.Node.impl_processCSS(Unknown Source)
at javafx.scene.Parent.impl_processCSS(Unknown Source)
at javafx.scene.Parent.impl_processCSS(Unknown Source)
at javafx.scene.Node.processCSS(Unknown Source)
at javafx.scene.Scene.doCSSPass(Unknown Source)
at javafx.scene.Scene.preferredSize(Unknown Source)
at javafx.scene.Scene.impl_initPeer(Unknown Source)
at javafx.stage.Window$10.invalidated(Unknown Source)
at javafx.beans.property.BooleanPropertyBase.markInvalid(Unknown Source)
at javafx.beans.property.BooleanPropertyBase.set(Unknown Source)
at javafx.stage.Window.setShowing(Unknown Source)
at javafx.stage.Window.show(Unknown Source)
at javafx.stage.Stage.show(Unknown Source)
at trythingsout.TryThingsOut.start(TryThingsOut.java:110)
at com.sun.javafx.application.LauncherImpl$5.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl$4.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl$3.run(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(Unknown Source)
at com.sun.glass.ui.win.WinApplication$2$1.run(Unknown Source)
at java.lang.Thread.run(Thread.java:722)