[Koha] Upgrade problem from 25.11 to 26.05

Good afternoon Upgrading from 25.11 to 26.05 one of my instancies blocks with: Upgrade to 25.12.00.059 [10:13:58]: Bug 40658 - Ensure local-number is sortable ERROR: Exception 'Koha::Exception' thrown 'Unable to update mappings for index "koha_mg_biblios". Reason was: "". Index needs to be recreated and reindexed' dpkg: Fehler beim Bearbeiten des Paketes koha-common (--configure): »installiertes post-installation-Skript des Paketes koha-common«-Unterprozess gab den Fehlerwert 1 zurück What can i do? Greetings     Beda