Solved Register form error, cause "missing-captcha", message: "No hCaptcha exists"

[cellarius]

Tested with with custom style (Flat Awesome by @Pixel Exit) AND default style.

When trying to register, the form won't submit. In the console the following error appears:
Code:

[hCaptcha] render: invalid container 'null'. api.js:4:90248

Uncaught
Object { cause: "missing-captcha", message: "No hCaptcha exists." }
api.js:4:84501
    qt https://hcaptcha.com/1/api.js?onload=XFHCaptchaCallback&render=explicit:4
    beforeSubmit https://www.DOMAINNAME.de/forum/js/xf/captcha.js?_v=3f022f8d:356...

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