My projects in Themebuilder breaks whenever I try to change the font size!
Steps to reproduce the error:
- Create a new project (Font icons, Q4 2025 latest, Bootstrap)
- Click on "Project setting".
- Click on "Metrics".
- Change:
- $kendo-font-size-md: 0.875rem
- $kendo-font-size-sm: 0.75rem
- $kendo-font-size-xs: 0.625rem
- Close project settings.
- Now the project is broken.
- Crash in javascript console:
Uncaught _P: There are errors in SASS and it cannot be compiled to CSS.
PATCH https://themebuilderapp.telerik.com/api/v1/projects/6928717ab857146bc01d9a2e/variables 500 (Internal Server Error) - The project cannot be saved:
- Crash in javascript console:
- It is no longer possible to load the project. The same error appears in the console as shown above.
- If I export the metadata from this broken project from the Dashboard and import it into a new project, that project also breaks. I have attached the metadata.
Please help!
Hello Douglas,
Thank you for reaching out and for providing the detailed reproduction steps!
I can confirm that the observed behavior is indeed a legitimate bug in ThemeBuilder, and the team is already working on a fix that will be released through a patch version. The issue was documented in the following public GitHub thread, which you can reference:
https://github.com/telerik/themebuilder/issues/181
Meanwhile, as a temporary solution, you can fix an affected project by following these steps:
- Export the broken metadata project
- Open the metadata file and delete all variables from the $kendo-font-size-xx family that have been modified. These variables have a modified ID that does not follow the original syntax of the unmodified variables (see the screenshot for an example).
- Save the modified metadata as a file named data.json and create a ZIP archive.
- Create a new project, then use the "Import Metadata" option while passing the archive with the saved metadata.
Regards,
Nick Iliev
Progress Telerik
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