Workflow user and SQL Error in Ax 2012

Error description:
Stopped workflow suddenly and throwing below error

Cannot select a record in Work items (WorkflowWorkItemTable). User: abc, Check and Approve Purchase Order.
The SQL database has issued an error.


Give Full CIL then error not resolved. 

We check batch job and showing there  batch job for workflow work item and due date getting stopped with error shown above. I changed the status of job to waiting.System Administrator->inquiries->Batch Jobs

After that workflow error resolved.