javascript - unexpected - uglify js error. Token inesperado: eof(indefinido)

webpack optimize uglifyjsplugin()

Question

Sigo recibiendo un error de token inesperado y no puedo entender por qué. Estoy usando uglifyJS con la tarea grunt-contrib-uglify pero también estoy obteniendo el error usando la línea de comando.

Using gulpfile c:/path/to/gulpfile.js
[14:05:53] Starting ''build''...
[14:05:53] Starting ''clean:build''...
[14:05:53] Finished ''clean:build'' after 30 ms
[14:05:53] Starting ''sass:build''...
[14:05:56] Finished ''sass:build'' after 2.52 s
[14:05:56] Starting ''images''...
[14:06:03] gulp-imagemin: Minified 3 images (saved 38.69 kB - 18.2%)
[14:06:03] Finished ''images'' after 7.47 s
[14:06:03] Starting ''templates''...
[14:06:15] Finished ''templates'' after 12 s
[14:06:15] Starting ''usemin''...
[14:06:30] { [Error: c:/path/to/assets/js/controller.js: Unexpected token: eof (undefined)]
  message: ''c://path/to//assets//js//controller.js: Unexpected token: eof (undefined)'',
  fileName: ''c://path/to//assets//js//controller.js'',
  lineNumber: 437,
  stack: ''Error/n    at new JS_Parse_Error (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:1526:18)/n    at js_error (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:1534:11)/n    at croak (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2026:9)/n    at token_error (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2034:9)/n    at unexpected (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2040:9)/n    at block_ (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2352:28)/n    at eval (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2326:25)/n    at function_ (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2331:15)/n    at expr_atom (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2546:24)/n    at maybe_unary (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2716:19)/n    at expr_ops (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2751:24)/n    at maybe_conditional (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2756:20)/n    at maybe_assign (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2780:20)/n    at maybe_assign (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2788:32)/n    at expression (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2799:20)/n    at simple_statement (eval at <anonymous> (c://path/to//node_modules//uglify-js//tools//node.js:22:1), <anonymous>:2240:55)'',
  showStack: false,
  showProperties: true,
  plugin: ''gulp-uglify'' }

Process finished with exit code 0

Comprobé la línea 437, pero no puedo encontrar el error.

$interval(function () {
    angular.forEach($scope.toDeleteEvent, function (time, eventId) {
        if($scope._events[eventId] && $scope._events[eventId].state > 1 && new Date().getTime() - time) {
            delete $scope.toDeleteEvent[eventId];
// this is a 437 line...
            $scope.deleteEvent($scope.idsByEvent[eventId].sport, $scope.idsByEvent[eventId].country, $scope.idsByEvent[eventId].league, eventId);
        }
    });
}, 300000);

¿Alguno de ustedes se encuentra con el mismo error?