From 44f4267cfc1097b5048cd2e49da73d4cbe7c69ed 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>

Signed-off-by: Joy Nelson <joy@bywatersolutions.com>
---
 C4/Circulation.pm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/C4/Circulation.pm b/C4/Circulation.pm
index 099c92a9e6..cbb2b11e80 100644
--- a/C4/Circulation.pm
+++ b/C4/Circulation.pm
@@ -2397,6 +2397,8 @@ 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(
                     {
-- 
2.20.1