System preference ClaimReturnedWarningThreshold manages the display of a patron message in case of too many claims. But this preference may be empty. This generates a warning : Argument "" isn't numeric in numeric gt (>) at /kohadevbox/koha/koha-tmpl/intranet-tmpl/prog/en/includes/patron_messages.inc line 128. Default value should be considered has 0 or infinite ? Before Bug 27873 code was in templates, bug still applies.