X-Git-Url: http://wagnertech.de/git?a=blobdiff_plain;f=SL%2FDB%2FInvoice.pm;h=14c11fa7d6b5c48e6d606d80be41ff497f4294f5;hb=4faddc6ffcf4c86cebf9944f1cc479902a4efd93;hp=91ee14c8584f404f23e50535c98d2b041a2a94cb;hpb=0e25aa33f76f465486d5fc36d23eabc829a7c29d;p=kivitendo-erp.git

diff --git a/SL/DB/Invoice.pm b/SL/DB/Invoice.pm
index 91ee14c85..14c11fa7d 100644
--- a/SL/DB/Invoice.pm
+++ b/SL/DB/Invoice.pm
@@ -93,7 +93,7 @@ sub taxamount {
   my $self = shift;
   die 'not a setter method' if @_;
 
-  return $self->amount - $self->netamount;
+  return ($self->amount || 0) - ($self->netamount || 0);
 }
 
 __PACKAGE__->meta->make_attr_helpers(taxamount => 'numeric(15,5)');