Proposer Field not populated in abci.header

Tendermint header does not contain a proposer address field however abci header does but during conversion its not populated . When I do ctx.BlockHeader().Proposer its null . I see context has a WithProposer but its not used anywhere right now ?
Is there a way to get proposer address in cosmos app ?

What version of Tendermint? Proposer address was added to header in v0.24

tendermint/tendermint/blob/master/CHANGELOG.md#0240

# Changelog

## v0.25.0

*September 22, 2018*

Special thanks to external contributors on this release:
@scriptionist, @bradyjoestar, @WALL-E

This release is mostly about the ConsensusParams - removing fields and enforcing MaxGas.
It also addresses some issues found via security audit, removes various unused
functions from `libs/common`, and implements
[ADR-012](https://github.com/tendermint/tendermint/blob/develop/docs/architecture/adr-012-peer-transport.md).

Friendly reminder, we have a [bug bounty program](https://hackerone.com/tendermint).

BREAKING CHANGES:

* CLI/RPC/Config
  * [rpc] [\#2391](https://github.com/tendermint/tendermint/issues/2391) /status `result.node_info.other` became a map