Uncaught exception: TypeError: Cannot read property 'code' of null at Object.redis.createClient.retry_strategy

var client = redis.createClient({
    retry_strategy: function (options) {
        if (options.error.code === 'ECONNREFUSED') {
            // End reconnecting on a specific error and flush all commands with a individual error
            return new Error('The server refused the connection');
        }
        if (options.total_retry_time > 1000 * 60 * 60) {
            // End reconnecting after a specific timeout and flush all commands with a individual error
            return new Error('Retry time exhausted');
        }
        if (options.times_connected > 10) {
            // End reconnecting with built in error
            return undefined;
        }
        // reconnect after
        return Math.max(options.attempt * 100, 3000);
    }
});

throw exception:

Uncaught exception:  TypeError: Cannot read property 'code' of null     at Object.redis.createClient.retry_strategy 

log out options:

{ 
  attempt: 1,
  error: null,
  total_retry_time: 0,
  times_connected: 1
 }

Start at the redis.createClient retry_strategy entry point and reproduce the shown configuration, checking the options object when error is null. Done means the retry strategy no longer throws the reported TypeError and the connection retry behavior remains covered by a regression test.