React.createElement: type should not be null, undefined, boolean, or number

[chris-hinds]

Hi, When importing and including this component on my page I receive the following errors:

React.createElement: type should not be null, undefined, boolean, or number

bundle.js:1 Error: Element type is invalid: expected a string (for built-in components) or a class/function

These error only appear when i an using the react-helmet component.

Here is my full component so far:

import Helmet from 'react-helmet';
import React from 'react';
import grandstand from 'grandstand';

export default class MyModule extends React.Component {
    constructor(props) {
        super(props);

        // initial state
    }

    componentWillMount() {
        grandstand(this.props.serviceName);
        console.log(Helmet);
    }

    render() {
        return (
            <div>
                <Helmet title="My Title"/>
                <h1>Welcome to the mobile web</h1>
            </div>
        )
    }
}

MyModule.displayName = 'MyModule';

MyModule.propTypes = {
    serviceName: React.PropTypes.string
};

[sjzamora86]

I'm having same issue in unit test using Enzyme full rendering

[cwelch5]

@hindsc52 This could be because you are console logging Helmet before the Helmet is mounted. If you remove the console do you still get the error?

[cwelch5]

@hindsc52 @sjzamora86 I can't seem to reproduce with the console log. And can't reproduce in my unit tests, using Karma though.

Do either of you see this issue in another component with Helmet? Or any more detail you can add to your experience?

[chris-hinds]

@cwelch5 Hi unfortunately i had stopped working on the project using this component so can no longer comment on the issue.

[potench]

Closing this issue since this thread is cold. Issue may be related to #190, so if we need to re-open this issue please post what version of Helmet you're using as this is fixed in v3.2.2