diff --git a/examples/vweb_fullstack/src/auth_services.v b/examples/vweb_fullstack/src/auth_services.v
index 798b9354774554..edd14c0412645d 100644
--- a/examples/vweb_fullstack/src/auth_services.v
+++ b/examples/vweb_fullstack/src/auth_services.v
@@ -37,6 +37,9 @@ fn (mut app App) service_auth(username string, password string) !string {
 	users := sql db {
 		select from User where username == username
 	}!
+	if users.len == 0 {
+		return error('user not found')
+	}
 	user := users.first()
 	if user.username != username {
 		return error('user not found')