ReactJS/Redux Exception – Uncaught TypeError: Cannot read property ‘type’ of undefined

This issue might occur in many cases but one case which is hard to troubleshoot and debug is as given below. The typical call stack looks as follows for the exception

Uncaught TypeError: Cannot read property 'type' of undefined
at bundle.js:64518
    at bundle.js:64518
    at Array.forEach (<anonymous>)
    at x (bundle.js:64518)

One can make out nothing from the call stack, it looks meaningless. Hence the debugging will be tedious job in ReactJS .

Solution for the above exception

check whether return statement with dispatch is missing in your redux action method.

  return (function (dispatch) {

  });

Your action should have return statement as shown above.