[Koha] Can't call method "biblioitemnumber" on an undefined value

[Michael Kuhn]

Hi

We are using Debian GNU/Linux 12 with Koha 24.05.05.

When running script "search_for_data_inconsistencies.pl" it shows only 
the following message:

Can't call method "biblioitemnumber" on an undefined value at 
/usr/share/koha/bin/maintenance/search_for_data_inconsistencies.pl line 152.

What does it mean, how can we find out what's the problem here?

Best wishes: Michael
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