This.setstate will unmount in callback

In fact, this is confused. I updated for React Router 4 which required a few changes and now when my server side registration errors return a console error:

setState (...): Can only update mounted or mounted component. This usually means that you called setState () on an unmounted component. This is a no-op. Check the code for the RegisterForm component.

What's really confusing is if I run this.setState({ errors: {createUserError: "Test error" }});

outside of the function Accounts.createUser

, I don't get the console error.

Any suggestions????

handleSubmit(event) {
    event.preventDefault();

    this.setState({errors: {} }, function() {
      var data = {
        email: this.state.email,
        password: this.state.password
      };

        Accounts.createUser(data, (error) => {   // This arrow function preserves this
        if(error) {
          this.setState({ errors: {createUserError: error.reason }});
        }
      });
    });
  }