Error while storing long strings

Hello!

I have just downloaded and installed marmotta from the github repository and i want to try out the geosparql capabilities of kiwi. I have successfully configured kiwi to use a postgis database as backend and I am storing a dataset with geometries, however, at some point it fails. I can see in the database that a lot of geometries have been stored successfully, however, I get the following error at some point:
org.postgresql.util.PSQLException: ERROR: string is too long for tsvector (1203006 bytes, max 1048575 bytes)

By the way, I understand why the geometries need to be stored as strings, but I wonder if they are also stored in binary format as well. From what I have seen in the database schema, they are not. I wonder if there is something else I need to do to store a geospatial RDF file (apart from having a postgis database as backend).

Thank you,
Constance