Server crashes when attempting to run JSON_OBJECTAGG as a window function

select

  json_objectagg(t.k, t.v) over (order by t.k)

from (

  select

    t.*

  from (

    select

      'a' as k,

      1 as v

  ) t

) as t

order by t.k;

SQL Error [08000]: Socket fail to connect to host:address=(host=localhost)(port=3307)(type=primary). Connection refused: no further information