I was seeing errors when trying to access revisions. Craft Support said this error is coming from Preparse.
InvalidArgumentException
The current node list is empty.
- 
in /home/domains/cenic.org/craft/vendor/symfony/dom-crawler/Crawler.phpat line 602
 593594595596597598599600601602603604605606607608609610611     * @throws \InvalidArgumentException When current node is empty
 */
 public function html(?string $default = null): string
 {
 if (!$this->nodes) {
 if (null !== $default) {
 return $default;
 }
      throw new \InvalidArgumentException('The current node list is empty.');
 }
 $node = $this->getNode(0);
 $owner = $node->ownerDocument;
 if ($this->html5Parser && '<!DOCTYPE html>' === $owner->saveXML($owner->childNodes[0])) {
     $owner = $this->html5Parser;
 }
 
