I observed the following exception in some user error logs of our application:

java.lang.NullPointerException:
    at javafx.scene.Scene$ClickGenerator.preProcess(Scene.java:3721)
    at javafx.scene.Scene$MouseHandler.process(Scene.java:4042)
    at javafx.scene.Scene.processMouseEvent(Scene.java:1947)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2784)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.get(GlassViewEventHandler.java:353)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.get(GlassViewEventHandler.java:255)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:429)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:573)
    at com.sun.glass.ui.View.notifyMouse(View.java:975)
    at com.sun.glass.ui.mac.MacView.notifyMouse(MacView.java:131)

The OS was macOS 26.1. I was not able to reproduce this yet, but I don't have a complex mouse with a lot of fancy buttons. If anyone has a mouse with many buttons, feel free to see if something happens in a JavaFX application when pressing them. I don't know how the mouse button can be NONE when arriving at that state.

The fix is straightforward and should not have any negative impacts.