Concurrent Insert threads generate errors

Inserting data into a simple table using multiple concurrent threads cause errors:
Table schema:
CREATE TABLE `facts` (
`invoice_id` int(11) NOT NULL,
`order_value` int(11) NOT NULL,
`customer_id` int(11) NOT NULL
) ENGINE=Columnstore
Multiple concurrent inserts, 2 or more, using array inserts or not, eventually seems to generate this error:
2016-06-14 20:24:11 MySQL Error: (1815)
Internal error: CAL0001: Insert Failed: a BRM VB entry error.