Executing Invisible reCAPTCHA, value is a null string

When using an invisible captcha, I’m doing this.captcha.execute() on submit. My onChange handler isn’t called and in the onSubmit, when I do this.captcha.getValue(), the value is a null string. What could cause this?

[yanivefraim]

@Sawtaytoes - this is how I do it, and it works for me:

<ReCAPTCHA
    ref={el => this.captcha = el}
    size="invisible"
    sitekey={getSiteKey()}
    onChange={token => this.submitForm(token)}
    />

<Button onClick={() => this.captcha.execute()}>
      Submit
</Button>

[leopucci]

@dozoisch ok I am learning how to play with that. THanks