Thanks to all for pointing out the error on the site. [1]It's an open
  bug on GitHub for Automattic's JetPack.

  Here's the fix from the bug thread:

    The following change to the core function get_the_content()
    eliminates the problem

if ( is_array( $pages ) ) {
   if ( $page > count( $pages ) ) // if the requested page doesn't exist
       $page = count( $pages ); // give them the highest numbered page that DOE
S exist
} else {
   $page = 0;
}


  … which I did from my Nexus 6P via ssh in a Termux session!
    __________________________________________________________________

  My original entry is here: . It posted Sat, 10 Mar 2018 05:54:56 +0000.
  Filed under: personal,

References

  Visible links
  1. https://github.com/Automattic/jetpack/issues/8420

  Hidden links:
  3. https://www.prjorgensen.com/?p=965