Internal: Invalid column name 'state' while getting Deffered item count

[Abhisarika]

Hi,

We have setup Defer time as 5Min while adding data to Work queue. While retrieving each item from queue, We are validating count of Deffered items. If count is greater than 0 than setup process to wait for 3 minutes. But we are getting "Internal: Invalid column name 'state' " error while getting the Differed item count.

Please help us to understand where the code went wrong.

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Thanks,
Abhisarika