When a job running on an Agent executes a Job Control Action, in some cases the command is sent to the Master for execution. When this happens the Master fails to execute the command and logs alert 5406 for the job:

An error occurred while executing a request for Agent XXX: Object reference not set to an instance of an object. Please contact technical support for assistance.


This occurs due to a problem on the Master instance, cause by a change introduced in version 4.8. Earlier versions are not affected.


A hotfix is available to resolve this issue.


  • adTempus 4
    A fix for this problem is available in the latest hotfix release for the software. Hotfix information.