TypeError: Cannot read property 'type' of undefined

[codac]

I'm getting the following error:

[12.10.2021 14:28.31.703] [ERROR] TypeError: Cannot read property 'type' of undefined
at Timeout.fetchStandings [as _onTimeout] (/opt/magic_mirror/modules/MMM-Formula1/node_helper.js:48:57)
at listOnTimeout (internal/timers.js:557:17)
at processTimers (internal/timers.js:500:7)

Maybe not received as an result of a timeout. Anyways there should be an error handling for.

[ianperrin]

Hi @codac

thanks for logging the issues. Unfortunately I’ve not been able to reproduce the error. Could you share your config and the version of the module you are using?

Thanks

[73cirdan]

Getting something similar, consequence is that the data is fetched normal, but first time update fails and data becomes stale. Will dive in, to explore the cause

1|mm  | [24.05.2022 12:38.11.647] [ERROR]
1|mm  | Whoops! There was an uncaught exception...
1|mm  | [24.05.2022 12:38.11.672] [ERROR]
1|mm  | TypeError: Cannot read properties of undefined (reading 'type')
1|mm  |     at Timeout.fetchStandings [as _onTimeout] (/home/pi/MagicMirror/modules/MMM-Formula1/node_helper.js:48:57)
1|mm  |     at listOnTimeout (node:internal/timers:557:17)
1|mm  |     at processTimers (node:internal/timers:500:7)
1|mm  | [24.05.2022 12:38.11.678] [ERROR]
1|mm  | MagicMirror² will not quit, but it might be a good idea to check why this happened. Maybe no internet connection?
1|mm  | [24.05.2022 12:38.11.680] [ERROR] If you think this really is an issue, please open an issue on GitHub: https://github.com/MichMich/MagicMirror/issues
1|mm  | [24.05.2022 12:38.11.685] [ERROR]
1|mm  | Whoops! There was an uncaught exception...
1|mm  | [24.05.2022 12:38.11.692] [ERROR]
1|mm  | TypeError: Cannot read properties of undefined (reading 'season')
1|mm  |     at Timeout.fetchSchedule [as _onTimeout] (/home/pi/MagicMirror/modules/MMM-Formula1/node_helper.js:63:83)
1|mm  |     at listOnTimeout (node:internal/timers:557:17)
1|mm  |     at processTimers (node:internal/timers:500:7)

My config.js

                {
                        module: 'MMM-Formula1',
                        classes: "default everyone",
                        position: 'top_right',
                        header: 'F1 Standings',
                        config: {
                                // Optional configuration options - see https://github.com/ianperrin/MMM-Formula1#configuration-options
                                calendar: true,
                                season: 2022,
                                maxRows: 6,
                                fade: false,
                        }
                },

[73cirdan]

added some logging. this.config is null, at the start of the fetch methods when called after the timeout...

[73cirdan]

It looks like after the timeout, the "this" object is a timeout object and not the nodehelper object anymore

[73cirdan]

Changed in the node_helper the fetchStandings and fetchSchedule methods in the same way:

      fetchStandings: function () {
               console.log(this.config);
               console.log(this.name + " is fetching " + this.config.type + " standings for the " + this.config.season + " season");
               const endpoint = this.config.type === "DRIVER" ? "getDriverStandings" : "getConstructorStandings";
               const season = (this.config.season === "current", new Date().getFullYear(), this.config.season);
               const self = this;
               f1Api[endpoint](season).then((standings) => {
                       console.log(this.name + " is returning " + this.config.type + " standings for the " + season + " season");
                       this.sendSocketNotification(this.config.type + "_STANDINGS", standings);
                       this.standingsTimerId = setTimeout(function () {self.fetchStandings(); }, this.config.reloadInterval);
               });
       },
``

added self=this and changed the call to the setTimeout method

[73cirdan]

added pullrequest #40 to fix this issue

[ianperrin]

Thanks @73cirdan