TypeError: ,0 is not iterable!

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TypeError: ,0 is not iterable!
  File "https://rucken-todo-django.herokuapp.com/polyfills.f3ba7cfbaed41eb19690.bundle.js", line 1, in e.exports
  File "https://rucken-todo-django.herokuapp.com/polyfills.f3ba7cfbaed41eb19690.bundle.js", line 1, in Anonymous function
  File "https://rucken-todo-django.herokuapp.com/polyfills.f3ba7cfbaed41eb19690.bundle.js", line 1, in Anonymous function
  File "https://rucken-todo-django.herokuapp.com/main.a56ccf6883b780e30530.bundle.js", line 1, in e
  File "https://rucken-todo-django.herokuapp.com/main.a56ccf6883b780e30530.bundle.js", line 1, in Anonymous function
  File "https://rucken-todo-django.herokuapp.com/main.a56ccf6883b780e30530.bundle.js", line 1, in Anonymous function
  File "https://rucken-todo-django.herokuapp.com/main.a56ccf6883b780e30530.bundle.js", line 1, in xrDH
  File "https://rucken-todo-django.herokuapp.com/inline.f5d68119f096d5669ac0.bundle.js", line 1, in o
  File "https://rucken-todo-django.herokuapp.com/main.a56ccf6883b780e30530.bundle.js", line 1, in rt+8
  File "https://rucken-todo-django.herokuapp.com/inline.f5d68119f096d5669ac0.bundle.js", line 1, in o