Failing notifications for single user

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1

I have a strange issue on my forum where notifications never load for a specific user (my personal admin account). Opening the user panel just displays a constant spinner:

Screenshot 2022-07-29 at 14.02.02
Screenshot 2022-07-29 at 14.02.02708×238 10.8 KB

While the following error is shown in the console:

Uncaught TypeError: Cannot read properties of undefined (reading 'dasherize')
    at n.itemHtml (application-ac4559e6c00dd9dba9d43d1d45d2ae68f856d62dbf2cf8586ad869941beeb2f9.js:1:3129645)
    at application-ac4559e6c00dd9dba9d43d1d45d2ae68f856d62dbf2cf8586ad869941beeb2f9.js:1:3132025
    at vendor-62026cfc8949fd8385062ba2d06d8ba217d1d9bc9fa1ceab497820ea41f11764.js:36:186831
    at t.Mixin.create.c.forEach (vendor-62026cfc8949fd8385062ba2d06d8ba217d1d9bc9fa1ceab497820ea41f11764.js:36:186564)
    at t.Mixin.create.c.map (vendor-62026cfc8949fd8385062ba2d06d8ba217d1d9bc9fa1ceab497820ea41f11764.js:36:186792)
    at n.html (application-ac4559e6c00dd9dba9d43d1d45d2ae68f856d62dbf2cf8586ad869941beeb2f9.js:1:3131999)
    at n.value (application-ac4559e6c00dd9dba9d43d1d45d2ae68f856d62dbf2cf8586ad869941beeb2f9.js:1:3203549)
    at n.value (application-ac4559e6c00dd9dba9d43d1d45d2ae68f856d62dbf2cf8586ad869941beeb2f9.js:1:3199618)
    at s (vendor-62026cfc8949fd8385062ba2d06d8ba217d1d9bc9fa1ceab497820ea41f11764.js:81:9828)
    at t.exports (vendor-62026cfc8949fd8385062ba2d06d8ba217d1d9bc9fa1ceab497820ea41f11764.js:81:9966)

where the offending function is:

        itemHtml: function(e) {
            var t = this.site.notificationLookup[e.notification_type];
            return this.attach("".concat(t.dasherize(), "-notification-item"), e, {}, {
                fallbackWidgetName: "default-notification-item"
            })
        }

If it helps, debugging shows that the error’s thrown when the value of e.notification_type is 800 (which seems very odd?) and t comes back as undefined.

This doesn’t affect any other account on the site, as far as I can tell, but I’d like to figure it out, if possible?