[Koha] Time out error during adding biblio records

Dear All I got Time out error during a book data entry in Koha 18.11.02.000 running on Ubuntu. Log entry at /var/log/koha/library/intranet-error.log says: [Fri Nov 08 15:29:31.477763 2019] [cgi:error] [pid 12363] [client 10.212.134.200:60754] AH01215: [Fri Nov 8 15:29:31 2019] addbiblio.pl: Argument "01e" isn't numeric in numeric ne (!=) at /usr/share/koha/intranet/cgi-bin/cataloguing/addbiblio.pl line 500.: /usr/share/koha/intranet/cgi-bin/cataloguing/addbiblio.pl, referer: http://myip:2087/cgi-bin/koha/cataloguing/addbiblio.pl Can anyone suggest some solution? Thanks in anticipation Regards, Ata