Payment-Helfer: Rechnen mit undefinierten Werten vermeiden

diff --git a/SL/DB/Helper/Payment.pm b/SL/DB/Helper/Payment.pm
index b7bf38a..64d6a63 100644 (file)
--- a/SL/DB/Helper/Payment.pm
+++ b/SL/DB/Helper/Payment.pm
@@ -387,7 +387,7 @@ sub open_amount {
   # if the difference is 0.01 Cent this may end up as 0.009999999999998
   # numerically, so round this value when checking for cent threshold >= 0.01
 
-  return $self->amount - $self->paid;
+  return ($self->amount // 0) - ($self->paid // 0);
 };
 
 sub open_percent {