.Property '[Symbol.iterator]' отсутствует ... "ошибка начала появляться после ng build --prod

Question

При запуске приложения Angular я получаю эту ошибку.

main-73e1a7066c.js:1 Uncaught TypeError: Cannot read property 'Symbol(Symbol.iterator)' of undefined
at d (main-73e1a7066c.js:1)
at v (main-73e1a7066c.js:1)
at new t (main-73e1a7066c.js:1)
at h (main-73e1a7066c.js:1)
at main-73e1a7066c.js:1
at Io (main-73e1a7066c.js:1)
at main-73e1a7066c.js:1
at new t (main-73e1a7066c.js:1)
at Object.ns [as createNgModuleRef] (main-73e1a7066c.js:1)
at e.create (main-73e1a7066c.js:1)