Cannot delete work centre from shift

When trying to save a Shift after deleting a work centre, the following error occurs:

Cannot insert duplicate key row in object 'dbo.BM_WarehouseWorkCentreShiftWeekdayCapacity' with unique index 'IX_BM_WarehouseWorkCentreShiftWeekdayCapacity_BM_ShiftWeekday_RecID_ItemNo'. The duplicate key value is (08f55cbd-72de-4cb6-b7be-0f830aa71c1f, 5).

Steps to reproduce (In demo data):

1. Create a new shift
2. Save
3. Remove the first work centre (Cutting)
4. Save
5. The error occurs.