Hi Symon:
First identify if the LMDB/CR Content is corrupt.
Please follow below notes:
1939864 - Check if SAP CR Content is corrupt in LMDB or SLD
Once you have identified of any corruptions please follow the notes to repair the content.
1093168 - Repair of SLD CR content
There is a very detailed blog on how to repair the SLD content.
Please note that it's always a good idea to take a backup of your existing content before you perform any updates.
Thanks.