[Koha] need help in error in koha 3.6.4

[Mohamed zalabany]

hi alli have system running on koha 3.6.4 with no zebrasuddenly message appear when we are saving bib records
the message Software error:Can't call method "as_usmarc" on an undefined value at /usr/share/koha/lib/C4/Search.pm line 2524.did any one faced this error before i need to solve this problemthanks for your help


Mohamed El Zalabany
Integrated library systems consultant


mh_zalabany at hotmail.com
Mobile: 0111291444