From e00fc00664d9782376ff75fb5bc48e3a5b3f3764 Mon Sep 17 00:00:00 2001
From: Juerd Waalboer <juerd@tnx.nl>
Date: Tue, 1 Oct 2019 02:40:00 +0200
Subject: [PATCH] Fix bug: warning when there is no acting user

---
 plugins/revspace_saldo | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/plugins/revspace_saldo b/plugins/revspace_saldo
index e8a644b..52fa2d7 100644
--- a/plugins/revspace_saldo
+++ b/plugins/revspace_saldo
@@ -15,6 +15,8 @@ sub _box {
 sub hook_checkout_done {
     my ($class, $cart, $user, $transaction_id) = @_;
 
+    defined $user or return;  # hacks like 'undo' don't have an acting user
+
     my $balance = RevBank::Users::balance($user) or return;
     my $since   = RevBank::Users::since($user);