Arithmatic overflow in binary_checksum

Transact-SQL
1

Hello

I am checking that all records in 16 tables are same.
It was all running well till 2 records added today and it begins to give error.

Procedure :
declare @t table (branch varchar(30) , checksumvalue bigint )

insert @t (branch, checksumvalue)
select branch=(select abbr from payfd53_sql.dbo.company)
, checksumvalue=sum(BINARY_CHECKSUM(card_code))
from payfd53_sql.dbo.am_blacklistEmployee

insert @t (branch, checksumvalue)
select branch=(select abbr from payfgrmn_sql.dbo.company)
, checksumvalue=sum(BINARY_CHECKSUM(card_code))
from payfgrmn_sql.dbo.am_blacklistEmployee

Error:
Arithmetic overflow error converting expression to data type int

What is the workaround?

2

Resolved
I changed
checksumvalue=sum(BINARY_CHECKSUM(card_code))
with
checksumvalue=sum(convert(decimal (18,0) ,BINARY_CHECKSUM(card_code)) )