Error Running diff-tables with --repair or --backfill

[louism517]

Hi,

First, thanks for a great tool. Provides a viable alternative to the relative black box that is the official AWS solution.

I have configured Dynamo replication using the replicator function with Lambda, but was keen to use the diff-tables script to attain a bit of confidence in what was being replicated. Unfortunately it fails whenever I attempt to pass the --repair or --backfill flag (i.e. to actually make any changes).

The stack trace is as follows:

/usr/local/lib/node_modules/dynamodb-replicator/node_modules/aws-sdk/lib/request.js:30
            throw err;
                  ^
TypeError: Object.keys called on non-object
    at Function.keys (native)
    at Response.<anonymous> (/usr/local/lib/node_modules/dynamodb-replicator/diff.js:206:32)
    at Request.<anonymous> (/usr/local/lib/node_modules/dynamodb-replicator/node_modules/aws-sdk/lib/request.js:353:18)
    at Request.callListeners (/usr/local/lib/node_modules/dynamodb-replicator/node_modules/aws-sdk/lib/sequential_executor.js:105:20)
    at Request.emit (/usr/local/lib/node_modules/dynamodb-replicator/node_modules/aws-sdk/lib/sequential_executor.js:77:10)
    at Request.emit (/usr/local/lib/node_modules/dynamodb-replicator/node_modules/aws-sdk/lib/request.js:595:14)
    at Request.transition (/usr/local/lib/node_modules/dynamodb-replicator/node_modules/aws-sdk/lib/request.js:21:10)
    at AcceptorStateMachine.runTo (/usr/local/lib/node_modules/dynamodb-replicator/node_modules/aws-sdk/lib/state_machine.js:14:12)
    at /usr/local/lib/node_modules/dynamodb-replicator/node_modules/aws-sdk/lib/state_machine.js:26:10
    at Request.<anonymous> (/usr/local/lib/node_modules/dynamodb-replicator/node_modules/aws-sdk/lib/request.js:37:9)

Any input would be appreciated!