ELN metainfo load problem

There seems to be a problem in loading the metainfo for some ELNs. This can be seen by e.g. opening up the 'User defined quantities' menu in the ELN app, or by browsing to certain ELN entries like this one: https://nomad-lab.eu/prod/v1/staging/gui/search/eln/entry/id/cRpj1UyvRt-I0Der2sCqfUw156at