mariadb-dump gets an error dumping schemas

If I run the mariadb-dump command via MaxScale I get an error on all Schemas which are NOT located on the first shard:

mariadb-dump --user=app --password=secret --host=10.153.125.219 --port=3306 --single-transaction customer_0010 > /tmp/customer_0010.sql
mariadb-dump --user=app --password=secret --host=10.153.125.219 --port=3306 --single-transaction customer_0020 > /tmp/customer_0020.sql
Error: Couldn't read status information for table address ()
Error: Couldn't read status information for table sales ()
mariadb-dump --user=app --password=secret --host=10.153.125.219 --port=3306 --single-transaction customer_0030 > /tmp/customer_0030.sql
Error: Couldn't read status information for table address ()
Error: Couldn't read status information for table sales ()

mariadb-dump --user=app --password=secret --host=10.153.125.219 --port=3306 --single-transaction --databases customer_0011 > /tmp/customer_0011.sql
mariadb-dump --user=app --password=secret --host=10.153.125.219 --port=3306 --single-transaction --databases customer_0021 > /tmp/customer_0021.sql
Error: Couldn't read status information for table address ()
Error: Couldn't read status information for table sales ()
mariadb-dump --user=app --password=secret --host=10.153.125.219 --port=3306 --single-transaction --databases customer_0030 > /tmp/customer_0030.sql
Error: Couldn't read status information for table address ()
Error: Couldn't read status information for table sales ()

customer_001? are on the first shard customer_002? on the second and so on...

I did not find anything in the docu prohibiting this...