Updating a property with PostGIS function

[ManuelePasini]

I've been giving some effort into integrating Apache AGE with PostGIS. I've come to the point where the following query works:

SELECT * FROM cypher('some_graph', $$
CREATE (n:Device {id: 'some_id',
type: 'Device',
location: st_geomfromgeojson('{"type": "Point", "coordinates": [11.798998, 44.235024]}'),
RETURN n
$$) AS (n agtype);

However, when I try to update such location via

SELECT * FROM cypher('some_graph', $$
MATCH (n:Device {id: 'some_id})
SET n.location = st_geomfromgeojson('{"type": "Point", "coordinates": [11.456556, 44.234324]}')
RETURN n
$$) AS (n agtype);

I get the error:

ERROR: agtype_volatile_wrapper: unsupported arg type
SQL state: 22023