BUG 11919: Not able to use the product, immediate logout after: error ColumnMap for undefined column: CASE_SUMMARY
SOLUTION: setting CASE_SUMMARY attribute sortable to false and checking if the $_POST['sort'] does not contains that index.
Merge pull request #1794 from ralpheav/master

BUG 11919: Not able to use the product, immediate logout after: error ColumnMap for undefined column: CASE_SUMMARY