[Koha] Can't call method "subfield" on an undefined value at /usr/share/koha/lib/C4/Biblio.pm line 2919.

[therrsonne02]

Can anyone help us on this? 
thanks in advance.
http://koha.1045719.n5.nabble.com/file/n5718221/software_error_line_2919.jpg 

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