When a node has scale attribute set to zero and a mouse event is subsequently fired on the object, then a ClassCastException is reported in the log; however, the application does not crash.

Click once on the red rectangle and then click again on the very same spot to reproduce the error.

Workaround: Set the scale value to a very small value, e.g. 0.0001.

import javafx.scene.Group;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.Color;
import javafx.scene.Scene;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

Stage {
    width: 250
    height: 250
    scene: Scene {
        content: Group {
            var scale = 1.0;
            content: [
                Rectangle {
                    x: 10
                    y: 10
                    width: 40
                    height: 40
                    scaleX: bind scale
                    fill: Color.RED
                    onMouseReleased: function(e:MouseEvent) {
                        scale = 0.0;
                    }
                }
            ]
        }
    }
}