[Ethereum] Error from web3.eth.getPastLogs() hex string without 0x prefix

I want to retrieve all token transfers to a given address by scanning the logs but receive an error. Am I doing something wrong? Could it be a web3 beta issue?

Code:

const Web3 = require('web3');
const web3 = new Web3(new Web3.providers.HttpProvider("http://127.0.0.1:8545"));
const transfer = web3.utils.keccak256( "Transfer(address,address,uint256)" );

// find all tokens received by this address ...
let sca = web3.utils.padLeft('0xEA674fdDe714fd979de3EdF0F56AA9716B898ec8', 64);

console.log( 'transfer: ', transfer );
console.log( '     sca: ', sca );

web3.eth.getPastLogs( {
    fromBlock: 1,
    toBlock: 'latest',
    topics: [transfer, null, sca, null]
  }
).then( (events) => { console.log( events ); } );  

Result:

transfer:  0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef
     sca:  0x000000000000000000000000EA674fdDe714fd979de3EdF0F56AA9716B898ec8

Unhandled rejection Error: Returned error: invalid argument 0: hex string without 0x prefix
    at Object.ErrorResponse (/home/acct/node_modules/web3-core-helpers/src/errors.js:29:16)
    at /home/acct/node_modules/web3-core-requestmanager/src/index.js:137:36
    at XMLHttpRequest.request.onreadystatechange (/home/acct/node_modules/web3-providers-http/src/index.js:64:13)
    at XMLHttpRequestEventTarget.dispatchEvent (/home/acct/node_modules/xhr2/lib/xhr2.js:64:18)
    at XMLHttpRequest._setReadyState (/home/acct/node_modules/xhr2/lib/xhr2.js:354:12)
    at XMLHttpRequest._onHttpResponseEnd (/home/acct/node_modules/xhr2/lib/xhr2.js:509:12)
    at IncomingMessage.<anonymous> (/home/acct/node_modules/xhr2/lib/xhr2.js:469:24)
    at emitNone (events.js:91:20)
    at IncomingMessage.emit (events.js:188:7)
    at endReadableNT (_stream_readable.js:975:12)
    at _combinedTickCallback (internal/process/next_tick.js:80:11)
    at process._tickCallback (internal/process/next_tick.js:104:9)

Environment:

• node.js 7.8.0
• web3 1.0.0-beta.22
• geth 1.7.3-stable on go1.9
• Ubuntu x86_64

Already tried:

• use WebsocketProvider instead of HttpProvider
• specify address: "0x..." in the filter with a real address
• replace fromBlock: 1 with `fromBlock: "0x1", and same using 0
• replace null topics with valid values
• forcing transfer and sca to be strings using for example sca = '' + web3…

Yet to try:

• revert to web3.js version 0.19