WordPress-发布请求后触发的函数生成错误500

Question

当我向我的WordPress Rest API发送发布请求以创建发布时，发布就很好了；但是如果在此发布请求之后添加动作以触发功能，则会收到错误500。

无论我使用什么钩子，都会发生错误：rest_insert_{$this->post_type}，save_post或transition_post_status ...

即使我通过邮递员发送请求，也会出现问题。

如何解决此错误并在发布请求后触发我的功能？

更新

这是我使用Nuxt（vuej）发送请求的代码：

async send() {
  if (this.$refs.form.validate()) {
    let payload = {};
    payload = {
      first_name: this.first_name,
      last_name: this.last_name,
      budget: this.budget,
      email: this.email,
      message: this.message
    };
    try {
      await axios({
        method: "post",
        url: this.baseUrl,
        data: {
          title: this.first_name + " " + this.last_name,
          fields: payload,
          status: "private"
        }
      });
    } catch (error) {
      console.error(error);
    }
  } else {
    window.scrollTo(0, 400);
  }
}

还有我的WP functions.php

add_action( 'save_post', 'custom_send_admin_email', 10, 3 );
function custom_send_admin_email( $post_id, $post, $update  ) {
    // Only want to set if this is a new post!
    if ( $update ){
        return;
    }

    // Only set for post_type = post!
    if ( 'message' !== $post->post_type ) {
        return;
    }
        // Consider sending an email here.
        $to = 'adebord@agencedebord.com';
        $subject = 'The subject';
        $body = 'Nom : ' . $post['acf']['nom'];
        $headers = array('Content-Type: text/html; charset=UTF-8');

        wp_mail( $to, $subject, $body, $headers );
}