Error when a meeting becomes author of a proposal

After assigning the authorship of a proposal to a meeting, whether: - if you click on the author (a meeting), - or if you want to see the meeting through the public view of the meetings component... the system sends you back an error message and there is no way to enter in the meeting again. To complete the information about this (in case it may have some relation): The proposal is linked to the meeting in which it was carried out too.