X-Git-Url: http://wagnertech.de/gitweb/gitweb.cgi/mfinanz.git/blobdiff_plain/5c886d92102c1f897e498d10fa6f58948f06ac78..55049b816f1c78769b3bfe734f033340d5872900:/SL/DB/Invoice.pm

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)');