If upgrade to version 8.0.9 of the glossary WordPress plugin Tooltip is throwing up fatal error while opening the website, the following can be tried as a fix:
- Access the website control panel and rename the folder enhanced-tooltipglossary to something else so that at least the website works without any error.
- Edit the file glossaryFree.php and comment out the lines 963 and 978.
- Rename the folder back to its original name.
- Open the website to check if it opens.