Joomla recently released version 3.9.18 of their awardwinning platform.
This is a simple bugfix for an error introduced by version 3.9.17 earlier today, and I hence had to upgrade again accordingly.
We have a number of customer sites on Joomla 3.x, and within hours of this release we had upgraded all affected portals accordingly.
More info on this release on: https://www.joomla.org/announcements/release-news/5808-joomla-3-9-18.html