Error:Process exited before completing request

[nikhil313]

Hi i get an error while testing the lambda function

execution result:
{
"errorMessage": "RequestId: 18fea243-5715-11e7-9ad9-a197117ae4d4 Process exited before completing request"
}

Log error:

START RequestId: 18fea243-5715-11e7-9ad9-a197117ae4d4 Version: $LATEST
2017-06-22T06:36:19.294Z 18fea243-5715-11e7-9ad9-a197117ae4d4 TypeError: Cannot read property '0' of undefined
at exports.handler (/var/task/CloudTrailEventProcessing.js:20:34)
END RequestId: 18fea243-5715-11e7-9ad9-a197117ae4d4
REPORT RequestId: 18fea243-5715-11e7-9ad9-a197117ae4d4 Duration: 99.90 ms Billed Duration: 100 ms Memory Size: 128 MB Max Memory Used: 33 MB
RequestId: 18fea243-5715-11e7-9ad9-a197117ae4d4 Process exited before completing request

Please Help