Doesn’t work plugin well with unknown reasons

Dear developers

Thank you for developing and maintaining this valuable plugin.

I selected this for generating static files of my site.

This time, I ask one weird situation I faced.

Even if I clicked “generate” button (『静的ファイルを生成する』 in Japanese), no actions made.

When I click the button, browser’s network tab show me the following rows.

### Request

Request URL: https://{domain}/wp-admin/admin-ajax.php

Request method: POST

Status code: 200

Payload: _ajax_nonce=55925e2031&action=static_archive_action&perform=start&is_network_admin=0&settings_type=site

### Response

action: "start"
activity_log_html: {last activity's log}
done: true
pages_status: {remaining: 1, total: 19}

### Request

Request URL: https://{domain}/wp-admin/admin-ajax.php

Request method: POST

Status code: 200

Payload: _ajax_nonce=55925e2031&action=static_archive_action&perform=ping&is_network_admin=0&settings_type=site

### Response

action: "ping"
activity_log_html: {last activity's log}
done: true
pages_status: {remaining: 1, total: 19}

The second response seems the process was done, but no files generated newly and the activity log shows the same one with last execution.

I’m using Docker image (wordpress: latest) with Docker Compose for making the environment

On configuration, it’s setting working_dir as /var/log/html.

All diagnostics returns OK.

I prepare other image setting working_dir as /var/log/html/aaa/.

The diagnostics conditions are the same with the first one, and this plugin can generate static files normally on this image.

Thank you for your support. I share you any details if you need.