Hello all. 5 days ago I upgraded my Koha from version 19.* to 21.11.05. During the upgrade there is no error message that I notice. Then I upgraded my OS from Debian 9 stretch to 11 bullseye. Same no error message. When I searched in staff opac the result came out fine. For example i search for "management" and the list related to management shows up. The problem started when a certain record from the result gave me An Error Has Occurred! Error 500. When I hit the back button and click 'Edit Record' or 'Edit Item' it worked fine. I tried to look at the record detail when I clicked Edit Record or Edit Item but I found nothing unusual. I compare with no problem records. Not all records gave me this error but I noticed some of it. I already tried running /usr/share/koha/bin/maintenance/touch_all_biblios.pl -v but the result came out with no error at all. I do have full access to the server and database if anyone can help me and need extra information. FYI Opac worked just fine if i clicked on the record. Only at staff Opac. If anyone here can help please reply or maybe can lead me to where i can investigate to solve this problem. Thank you very much...