Calling a method or accessing a member of an undefined object will throw a
fatal error that looks like this: "can't call method * on an undefined
value at ..."
For example, this code will cause a software error if $data->{itemnumber}
exists, but the item doesn't exist (maybe it's been deleted?):
my $item = Koha::Items->find( $data->{itemnumber} );
my $biblio = $item->biblio;
How this is handled will of course depend on context -- maybe we should
carp and continue, or maybe just
my $item = Koha::Items->find( $data->{itemnumber} );
my $biblio = $item->biblio if defined $item;
I would like to add a coding standard that we always check for this.
Thanks,
--Barton
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