[OJS 2.4.8.5] DB Error: Duplicate entry '601' for key 'custom_issue_orders_pkey'

Hello.

We upgrade OJS 2.4.3.0 to 2.4.8.5

This OJS is multijournal.

When we try to order the numbers of a Journal

DB Error: Duplicate entry '601' for key 'custom_issue_orders_pkey'

Other journals can be ordered without problems

What can i do?

Thank you