Cannot read property 'sanity' of undefined in Sanity Studio
Uncaught error
Cannot read property 'sanity' of undefined
Stack:
TypeError:
at <https://dolcestilcriollo.sanity.studio/static/js/app.bundle.js?f8e5bbd157acfb86fc43:1163:3413841>
at ye (<https://dolcestilcriollo.sanity.studio/static/js/app.bundle.js?f8e5bbd157acfb86fc43:30:552292>)
at ye (<https://dolcestilcriollo.sanity.studio/static/js/app.bundle.js?f8e5bbd157acfb86fc43:30:552065>)
at e.t.createStyles (<https://dolcestilcriollo.sanity.studio/static/js/app.bundle.js?f8e5bbd157acfb86fc43:30:558162>)
at e.t.renderStyles (<https://dolcestilcriollo.sanity.studio/static/js/app.bundle.js?f8e5bbd157acfb86fc43:30:558401>)
at u (<https://dolcestilcriollo.sanity.studio/static/js/app.bundle.js?f8e5bbd157acfb86fc43:30:558961>)
at <https://dolcestilcriollo.sanity.studio/static/js/app.bundle.js?f8e5bbd157acfb86fc43:30:558777>
at ro (<https://dolcestilcriollo.sanity.studio/static/js/vendor.bundle.js?2163562f6812e454f877:17:83208>)
at lo (<https://dolcestilcriollo.sanity.studio/static/js/vendor.bundle.js?2163562f6812e454f877:17:83311>)
at pu (<https://dolcestilcriollo.sanity.studio/static/js/vendor.bundle.js?2163562f6812e454f877:17:101245>)
(Your browsers Developer Tools may contain more info)This error Cannot read property 'sanity' of undefined is a known issue from Sanity Studio v2 that's related to theme configuration and dependency conflicts with styled-components. Here's how to fix it:
Quick Solutions
1. Delete dependencies and reinstall (Most reliable fix)
# Remove lock file and node_modules
rm -rf node_modules package-lock.json
# or if using yarn:
rm -rf node_modules yarn.lock
# Reinstall everything
npm install
# or
yarn installThis resolved the issue for multiple users experiencing the same problem.
2. Upgrade to the latest Sanity version
The error was particularly common in Sanity v2.1.x through v2.5.x. Updating often fixes it:
sanity upgradeOne user confirmed that upgrading from v2.5.0 to the latest version solved the issue.
3. Check for plugin conflicts
If the error appeared after installing a plugin (like sanity-plugin-power-table or sanity-plugin-tabs):
- Temporarily remove the plugin to confirm it's the cause
- Update to the latest Sanity version (plugins may require newer versions)
- Check if the plugin itself has updates
What Caused This?
The root issue was a dependency mismatch in Sanity's dependency tree:
@sanity/form-builderdepended on@sanity/ui@^0.28.0@sanity/ui@0.28.0requiredstyled-components@^5.2as a peer dependency- But the installation was pulling in both v5.1 and v5.2 of
styled-components
This created a situation where the theme object structure wasn't what the code expected, causing theme.sanity to be undefined.
The Sanity team fixed this in later versions by making @sanity/ui and styled-components peer dependencies instead of direct dependencies, which resolved the version conflicts.
If You're on Studio v3
If you're using Sanity Studio v3 (the current version), this issue shouldn't occur. Make sure you're running:
- Node.js 20 or higher
- The latest
sanitypackage (npm install sanity@latest)
The quickest fix is usually deleting your lock file and node_modules, then reinstalling fresh. If that doesn't work, upgrade to the latest Sanity version.
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