[Koha] Software error

[Perch]

This message appears in various situations. Checking items out/in, adding a
new issue to an existing subscription and so on.

Software error:

Can't call method "subfield" on an undefined value at
/usr/share/koha/lib/C4/Biblio.pm line 3008.

For help, please send mail to the webmaster (webmaster at vps185), giving this
error message and the time and date of the error. 

Any ideas?

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