Uncaught TypeError: Cannot read property 'apply' of undefined

[MarcP]

Please refer to topic below, this containts newer information about my issue.

Can not save Default Watched Category/Tags

Ok this is happening in this code block: define("discourse/routes/about", ["exports", "discourse/lib/ajax", "discourse/routes/discourse"], function(e, t, n) { "use strict"; Object.defineProperty(e, "__esModule", { value: !0 }), e.default = n.default.extend({ model: function() { var o = this; return (0, t.ajax)("/about.json").then(function(i) { var t = [] , n = [] , s = moment(…