This problem appears on sandboxes (PTFS-europe and Biblibre) in UNIMARC. Can't call method "itemtype" on an undefined value at /kohadevbox/koha/opac/opac-detail.pl line 709
The problem comes probably from sample data. We have no problem with different data from sample.
Same results with MARC21 and UNIMARC
Works fine for me. Can you provide steps to reproduce the problem?
I created an UNIMARC sandbox on http://sandboxes.ptfs-europe.co.uk/ When it was created, I connected on OPAC and searched 'tintin'. I chose the first result : "[Les ]aventures de Tintin, reporter au Petit vingtième, au pays des Soviets" and clicked on it. Then I got this page : http://opac-sampled.sandboxes.ptfs-europe.co.uk/cgi-bin/koha/opac-detail.pl?biblionumber=4734&query_desc=kw%2Cwrdl%3A%20tintin After that, I reproduced it on Staff. I searched 'tintin' in catalog and I chose the first result (same in OPAC). On detail.pl, I clicked on Barcode and then I got the same error page. I get same results with MARC21 or with Biblibre platform : https://sandboxes.biblibre.eu/
Looks like you probably didn't provide an item type for the record. I know there was some work around errors on missing item types, so this is probably a duplicate report...
*** This bug has been marked as a duplicate of bug 32747 ***
This should be moved to https://gitlab.com/koha-community/koha-misc4dev, to fix the UNIMARC data.