v3-sub graph on blast some error

[hunting2022]

Compile subgraphERROR TS2322: Type '~lib/@graphprotocol/graph-ts/common/numbers/BigInt' is not assignable to type 'i32'.

 const decimalValueBigInt = BigInt.fromI32(decimalResult.value)
                                           ~~~~~~~~~~~~~~~~~~~

in src/utils/token.ts(81,47)

how to handle it ??? plaz