Go to Extensions -> Modules and select a type from the listbox in the table header. Notice that it results in an error:
Exception 'KDatabaseException' with message 'Unknown column 'Array' in 'order clause' of the following query : SELECT `tbl`.* FROM `jos_modules` AS `tbl` WHERE `tbl`.`module` = 'mod_related_items' AND `tbl`.`client_id` = 0 ORDER BY Array ASC , `tbl`.`ordering` ASC LIMIT 0 , 20'
It's because KTemplateFilterForm adds the following field to the form:
<input type="hidden" name="sort" value="Array">
Attached a patch which fixes this problem.
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