Worked on improving the stability of math rendering in the quarto-dev/quarto-cli repository, focusing on KaTeX previews within cross-reference popups. Addressed a persistent null pointer exception by implementing a targeted JavaScript fix that checks for valid text node data before rendering, which prevented both crashes and double-rendering issues in Tippy.js popovers. This update enhanced the reliability of math previews in documentation and editor environments, reducing user-reported rendering failures and support requests. The work emphasized robust front end development practices, prioritizing user experience and maintainability over new feature delivery during the period, and demonstrated careful attention to detail in JavaScript code.