Unable to save job config after updating to the latest version of Jenkins

Unable to save job config after updating to the latest version of Jenkins. Steps to reproduce.

1. Push a job to Jenkins using JJB
2. Jenkins -> login -> Find the job -> configure
3. Change any of the job config settings
4. Save changes in the job config.
5. Returns the below error

net.sf.json.JSONException: JSONObject["com-sonyericsson-hudson-plugins-gerrit-trigger-hudsontrigger-GerritTrigger"] is not a JSONObject.
    at net.sf.json.JSONObject.getJSONObject(JSONObject.java:2006)
...    at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:383)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:882)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1036)