Using Scene Builder, drop an AnchorPane and a Button.
Select the Button and set the RotationAxis.X to 1 (from inspector Layout section)
Use the Rotate property handle to rotate the Button: the following NPE is raised.

Note this is a regression from Java 8 to 8u20: with the same SB code one doesn't get the NPE using 8, when one get it using 8u20 or 8u40.

SEVERE: An exception was thrown:
java.lang.IllegalStateException: Cannot transform 2D point with a 3D transform
at com.sun.javafx.scene.transform.TransformUtils$ImmutableTransform.ensureCanTransform2DPoint(TransformUtils.java:824)
at com.sun.javafx.scene.transform.TransformUtils$ImmutableTransform.transform(TransformUtils.java:392)
at com.oracle.javafx.scenebuilder.kit.editor.panel.content.AbstractDecoration.sceneGraphObjectToDecoration(AbstractDecoration.java:166)
at com.oracle.javafx.scenebuilder.kit.editor.panel.content.AbstractDecoration.sceneGraphObjectToDecoration(AbstractDecoration.java:129)
at com.oracle.javafx.scenebuilder.kit.editor.panel.content.driver.handles.AbstractGenericHandles.layoutDecoration(AbstractGenericHandles.java:217)
at com.oracle.javafx.scenebuilder.kit.editor.panel.content.AbstractDecoration.lambda$2(AbstractDecoration.java:227)
at com.oracle.javafx.scenebuilder.kit.editor.panel.content.AbstractDecoration$$Lambda$527/2147244218.changed(Unknown Source)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:182)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.scene.Node$LazyTransformProperty.invalidate(Node.java:9319)
at javafx.scene.Node$NodeTransformation.invalidateLocalToSceneTransform(Node.java:5807)
at javafx.scene.Node.invalidateLocalToSceneTransform(Node.java:5540)
at javafx.scene.Node.impl_transformsChanged(Node.java:4751)
at javafx.scene.Node$NodeTransformation$8.invalidated(Node.java:6007)
at javafx.beans.property.DoublePropertyBase.markInvalid(DoublePropertyBase.java:112)
at javafx.beans.property.DoublePropertyBase.set(DoublePropertyBase.java:146)
at javafx.css.StyleableDoubleProperty.set(StyleableDoubleProperty.java:82)
at javafx.scene.Node.setRotate(Node.java:5437)
...