this.serverHandler.sockWrite is not a function

[quantumwebco]

    "laravel-mix": "^6.0.31",
    "laravel-mix-blade-reload": "^2.0.0",

npx mix watch --hot compiles fine the first time but when saving a file throws this error and the browser is not hot reloaded

/node_modules/laravel-mix-blade-reload/dist/index.js:89
            this.serverHandler.sockWrite(this.serverHandler.sockets, 'content-changed');
                               ^

TypeError: this.serverHandler.sockWrite is not a function
    at BladeReload.reload (/node_modules/laravel-mix-blade-reload/dist/index.js:8
9:32)

What other information do you need to debug?

Thanks