diff --git a/app/controllers/webhooks_controller.rb b/app/controllers/webhooks_controller.rb
index 8dbfbc8..487f43c 100644
--- a/app/controllers/webhooks_controller.rb
+++ b/app/controllers/webhooks_controller.rb
@@ -11,7 +11,7 @@ class WebhooksController < ApplicationController
       head :unprocessable_entity and return
     end
 
-    user = User.find_by(ln_account: payload[:user_login])
+    user = User.find_by!(ln_account: payload[:user_login])
 
     # TODO make configurable
     notify_xmpp(user.address, payload[:amount], payload[:memo])