Unable to delete some contents that are not indexed in intid

[cekk]

Hi,
i have a strange situation on a Plone 5.1 installation.

I can't delete some contents because apparently they are not indexed in intid.

plone.app.linkintegrity/plone/app/linkintegrity/utils.py

Line 19 in 823a826

intid = intid if intid is not None else getUtility(IIntIds).getId(obj)

When p.a.linkintegrity tries to get the id, intids throws a KeyError.
It seems that this content isn't on intid catalog for some strange reasons.

This is not a p.a.linkintegrity problem, but could be a good idea handling this error? If the content isn't on intid, probably there isn't any relation to it and we can skip this check somehow.