Posts do not render for editing with this plugin enabled

This plugin has been very helpful to address some very long series I provide at my site. Thank you! It’s been useful for years.

But over the last year, I’ve had intermittent problems with posts being editable – the edit link leads to a blank page. Today, I finally tracked it down to being caused by this plugin. That’s with WordPress 4.9.8. I was able to get 100% edit display failure when I enabled the new Gutenberg plugin.

I’m afraid this plugin has reached end of life, unless it is updated.

If there’s anything you can do to update it, that would be wonderful. Thanks!