# Build fails with Cannot read properties of undefined (reading 'substring')
bug: Repeated builds doesn't always succeed every time
bug: pending triage
The build reported an error, but development and preview worked correctly
bug: pending triage
Ambiguous error in build process/temp files deleted on failed build
bug: pending triage
Cannot read properties of undefined (reading '_s')
bug: pending triage
build error: vitepress data not properly injected in app
need more info