Error while producing messages

[cantidio]

It seems the value is undefined and is not being catched by the code before it, which checks for null only.

if (value !== null) { // <===== here
        if (Buffer.isBuffer(value)) {
            m.Int32BE(value.length);
        } else {
            if (typeof value !== 'string') value = value.toString();
            m.Int32BE(Buffer.byteLength(value));
        }
        m.string(value);
    } else {
        m.Int32BE(-1);
    }

This results on this error when I run the example provided on the readme.

/Users/cantidio/Projects/node-kafka-rx/node_modules/kafka-node/lib/protocol/protocol.js:385
            if (typeof value !== 'string') value = value.toString();
                                                        ^

TypeError: Cannot read property 'toString' of undefined
    at encodeMessage (/Users/cantidio/Projects/node-kafka-rx/node_modules/kafka-node/lib/protocol/protocol.js:385:57)
    at /Users/cantidio/Projects/node-kafka-rx/node_modules/kafka-node/lib/protocol/protocol.js:358:19
    at Array.forEach (native)
    at encodeMessageSet (/Users/cantidio/Projects/node-kafka-rx/node_modules/kafka-node/lib/protocol/protocol.js:357:16)
    at /Users/cantidio/Projects/node-kafka-rx/node_modules/kafka-node/lib/protocol/protocol.js:345:30
    at Array.forEach (native)
    at /Users/cantidio/Projects/node-kafka-rx/node_modules/kafka-node/lib/protocol/protocol.js:344:14
    at Array.forEach (native)
    at _encodeProduceRequest (/Users/cantidio/Projects/node-kafka-rx/node_modules/kafka-node/lib/protocol/protocol.js:338:12)
    at /Users/cantidio/Projects/node-kafka-rx/node_modules/kafka-node/lib/protocol/protocol.js:326:16

When I fixed this check, everything works as expected.