WordPress结账页面出现Array to string conversion警告的问题求助

大家好，我最近在做大学作业的项目，用WordPress搭配主题模板搭建网站，本来一切都挺顺利的，结果在访问结账页面的时候突然弹出了这个警告：

"Warning: Array to string conversion in C:\xampp\htdocs\keebid\wp-includes\formatting.php on line 1108"

我把报错位置的相关代码贴出来，麻烦各位帮忙看看问题出在哪：

function wp_check_invalid_utf8( $text, $strip = false ) {
    $text = (string) $text;

    if ( 0 === strlen( $text ) ) {
        return '';
    }
    
    // Store the site charset as a static to avoid multiple calls to get_option().
    static $is_utf8 = null;
    if ( ! isset( $is_utf8 ) ) {
        $is_utf8 = in_array( get_option( 'blog_charset' ), array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ), true );
    }
    if ( ! $is_utf8 ) {
        return $text;
    }
    
    // Check for support for utf8 in the installed PCRE library once and store the result in a static.
    static $utf8_pcre = null;
    if ( ! isset( $utf8_pcre ) ) {
        // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
        $utf8_pcre = @preg_match( '/^./u', 'a' );
    }
    if ( ! $utf8_pcre ) {
        return $text;
    }
    
    // Check if the text contains invalid UTF-8.
    if ( ! preg_match( '/^./us', $text ) ) {
        $text = wp_encode_string( $text );
        if ( $strip && function_exists( 'mb_convert_encoding' ) ) {
            $text = mb_convert_encoding( $text, 'UTF-8', 'UTF-8' );
        }
    }

    return $text;
}

目前我还没搞清楚到底是哪里传入了数组，导致这个字符串转换的错误，希望有经验的朋友能给我一些排查方向或者解决办法，谢谢啦！

备注：内容来源于stack exchange，提问作者Rendy Arya Kusuma