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[GH-ISSUE #6763] this.append is not a function error when trying to log in #19306
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Originally created by @spizzadev on GitHub (Jan 27, 2026).
Original GitHub issue: https://github.com/dani-garcia/vaultwarden/issues/6763
Prerequisites
Vaultwarden Support String
not applicable
Vaultwarden Build Version
v1.35.2/latest/v1.35.2-alpine
Deployment method
Official Container Image
Custom deployment method
No response
Reverse Proxy
traefik 3.4.4
Host/Server Operating System
Linux
Operating System Version
Alpine Linux
Clients
Web Vault
Client Version
2025.12.1
Steps To Reproduce
note: I use cloudflare's dns-only records, so no js manipulation is happening there, js files appear as js in my browser.
3. Open https://vault.example.com, try to sign up, once you click the button it shows a toast "this.append is not a function" and you are unable to login. (this is an issue for SSO too)
Expected Result
Normal login procedure
Actual Result
error message + not able to login
Logs
Screenshots or Videos
Additional Context
I run another instance the same way (traefik + cloudflare + alpine) which worked perfectly fine in the past but since upgrading the same issue appeared. for that instance the bitwarden android app and browser extension continued to work, just the web vault is causing problems.