The window open handler response must be an object, but was instead of type 'undefined'.

[FlysoftBeta]

I try using webcontents.setWindowOpenHandler in renderer process, and the console prints "The window open handler response must be an object, but was instead of type 'undefined'." Here is my code:

tab.webcontents.setWindowOpenHandler((details) => {
                this.new(details.url);
                return {
                    action: "deny",
                }
            });

[FlysoftBeta]

https://github.com/electron/electron/issues/30017#issuecomment-877398729