From 53349e8000d7073220fedb48bcd910abec7a592b Mon Sep 17 00:00:00 2001
From: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Date: Fri, 8 May 2020 12:28:46 +0200
Subject: [PATCH] Bug 25417: Prevent negative debit amount on backdating
 returns

Koha::Account->add_credit is expecting a positive amount.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Didier Gautheron <didier.gautheron@biblibre.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
---
 C4/Circulation.pm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/C4/Circulation.pm b/C4/Circulation.pm
index 8db887db2e..99e1423e51 100644
--- a/C4/Circulation.pm
+++ b/C4/Circulation.pm
@@ -2433,6 +2433,8 @@ sub _FixOverduesOnReturn {
             if ($exemptfine) {
                 my $amountoutstanding = $accountline->amountoutstanding;
 
+                return if $amountoutstanding <= 0;
+
                 my $account = Koha::Account->new({patron_id => $borrowernumber});
                 my $credit = $account->add_credit(
                     {
-- 
2.39.5