Solved Advanced search is broken for guests

[Xon]

Accessing Search as a guest throws an internal server error.

Accessing Oops! We ran into some problems. returns "Please specify a search query or the name of a member.".


The internal server error is caused by:
PHP:

    /**
     * @return array<string, mixed>
     */
    public function getSearchFormTab(): array
    {
        if (!\XF::visitor()->user_id)
        {
            return null;
        }...

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