for my $c ( $table->get_constraints ) {
my $name = $c->name || '';
my @fields = map { quote($_,$qf) } $c->fields;
- my @rfields = quote($c->reference_fields,$qf);
+ my @rfields = map { quote($_,$qf) } $c->reference_fields;
+
next if !@fields && $c->type ne CHECK_C;
if ( $c->type eq PRIMARY_KEY ) {