Workflow Add-On; Workflow Search form; Adding the 'Category' column to the results grid caused an unhandled exception.

If the Category column was selected on the column chooser and the results was refreshed the following error was displayed:

ERROR MESSAGE
=============
An unhandled exception has occurred.

Column 'WorkflowTypePk' does not belong to table Table.


The WorkflowTypePk was required to obtain the category but the WorkflowTypePk was not being added to the database query.