yes, It works after turning on identity.

it is safe to turning on the identity on StateLogId because single server don't use this table.

only web farm model will use this table to save sessions in this table.

 

Detailed step:

Step 1: Turn on identity

You can manually add identity to StateLogId column 

If you use SQL Script:

    ALTER   TABLE   CuteChatTempStateLog   DROP   COLUMN   StateLogId 
    GO
    ALTER   TABLE   CuteChatTempStateLog   ADD   StateLogId   INT   IDENTITY(1,1)