Custom Trigger - TimeoutException

Hi,

After upgrading to the latest version available to us (9218) we have noticed our custom trigger is no longer working. We use the custom trigger when new incidents are raised to send the details to our teams slack channel, but now when an issue is raised in the ticket history we get the following error:

Action by Ian Jones on Jun 23, 2016 04:16 PM

Action menu "Action Executed is :Send to Slack" invoked

Action by System on Jun 23, 2016 04:17 PM

Action Executed is :Send to Slack
Message: JobExecution Failed in ExternalActionJobExecutor due to time out:java.util.concurrent.TimeoutException

We've verified the python script away from ME and it runs and sends details to slack without problem, so any assistance in narrowing down the problem with Me would be appreciated!

Cheers,

Ian