so I do this search https://library.prasetiyamulya.ac.id/cgi-bin/koha/opac-detail.pl?biblionumber=37041&query_desc=kw%2Cwrdl%3A%20The%20Design%20of%20everyday%20things while 3 results are shown, two of the shown error like this: Software error: Can't call method "title" on an undefined value at /usr/share/koha/opac/cgi-bin/opac/opac-detail.pl line 470. I find it weird because the book detail is shown fine when I use searching by catalogue.
Did you fix the issue? At the moment there is only one result for the search posted below in your catalogue.