[Dbix-class] DBIx::Class::Storage::DBI _verify_pid from DESTROY throwing _dbh->{} STORE error

[Gareth Kirwan]

(in cleanup) Can't call method "STORE" on an undefined value at
/usr/local/lib/perl5/site_perl/5.8.8/DBIx/Class/Storage/DBI.pm line 677
during global destruction.

When a forked process exits DESTROY calls _verify_pid.

$self->_dbh returns true, yet any access to the tie causes a FETCH or STORE
error.

Any ideas?