diff --git a/dashboard/frontend/src/routes/Settings.svelte b/dashboard/frontend/src/routes/Settings.svelte
index e70f1db..8af41db 100644
--- a/dashboard/frontend/src/routes/Settings.svelte
+++ b/dashboard/frontend/src/routes/Settings.svelte
@@ -40,6 +40,9 @@
     passkeyLoading = true;
     passkeyMsg = ""; passkeyErr = "";
     try {
+      if (!window.PublicKeyCredential) {
+        throw new Error("Passkeys are not supported in this browser or context");
+      }
       const opts = await post("/auth/passkey/register/options");
       opts.challenge = base64urlToBuffer(opts.challenge);
       opts.user.id = base64urlToBuffer(opts.user.id);