$setuptax = exists($_[0]->{setuptax}) ? $_[0]->{setuptax} : '';
$taxclass = exists($_[0]->{taxclass}) ? $_[0]->{taxclass} : '';
$classnum = exists($_[0]->{classnum}) ? $_[0]->{classnum} : '';
- $additional = $_[0]->{additional};
+ $additional = $_[0]->{additional} || [];
$taxproduct = $_[0]->{taxproductnum};
$override = { '' => $_[0]->{tax_override} };
} else {