mps problem if I use the electron library

[DamianoCasolari]

Using the electron library when I run the application it gives me the following error:

(node:5664) UnhandledPromiseRejectionWarning: TypeError: Cannot set properties of undefined (setting 'mps')
(Use electron --trace-warnings ... to show where the warning was created)
(node:5664) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)

The solution with which I solved this problem was to modify line 35 in the FinsSequenceManager.js file from
self.mpsCounter = this.mps = 0;
to
self.mpsCounter = 0;