Cannot parse the db number correctly

I am getting this error:

{ ReplyError: ERR DB index is out of range
    at parseError (/root/interos/repos/ntrs-cli/node_modules/redis-parser/lib/parser.js:179:12)
    at parseType (/root/interos/repos/ntrs-cli/node_modules/redis-parser/lib/parser.js:302:14) command: { name: 'select', args: [ '20127' ] } }

here is what I have:

const client_db0 = new Redis(`redis://${conf["platform-build.public-dns"]}:6379/0`);
const client_db1 = new Redis(`redis://${conf["platform-build.public-dns"]}:6379/1`);
const client_db2 = new Redis(`redis://${conf["platform-build.public-dns"]}:6379/2`);
const client_db3 = new Redis(`redis://${conf["platform-build.public-dns"]}:6379/3`);

[tuananh]

because space is encode to %20 so it becomes redis://%20127.0.0.1:6379/1

[tuananh]

that error is quite misleading