Title Merge errors out on a non-existing 'input' value. To recreate the problem, pull up the "Proposed Title Merge Submission" page, save it as an HTML file, then manually edit the saved file. Change the value in a line like:
input type="radio" name="title_ttype" value="2"
(where "title_ttype" is a field name and "value" is a valid record number) from a valid value like "2" to an invalid value like "9999" or "XYZ". Submit the form and it will result in an Apache error.
Anonymous