diff --git a/src/components/AuthButton.tsx b/src/components/AuthButton.tsx
index 146259f..e47c4f9 100644
--- a/src/components/AuthButton.tsx
+++ b/src/components/AuthButton.tsx
@@ -71,7 +71,9 @@ export function AuthButton() {
           try {
             await login();
           } catch (e: any) {
-            if (e.name === 'NotAllowedError') {
+            // Any WebAuthn error (NotAllowedError, SecurityError, AbortError)
+            // should show register form — user likely has no passkey yet
+            if (e.name === 'NotAllowedError' || e.name === 'SecurityError' || e.name === 'AbortError') {
               setShowRegister(true);
             } else {
               setError(e.message || 'Sign in failed');