ERROR: XX000: cannot update SecondarySnapshot during a paralleloperation

Dear Sir/Madam

I got an error when I execute the following select sentence.

Would you please solve the problem for me?

Thank you .

Alan Fu.

postgres=# \set VERBOSITY verbose

postgres=# SELECT round(cast(coalesce(sum(ST_length(geography(geometry)))/1000,0) as NUMERIC),4)||'KM' field_value from had_link;

ERROR:  XX000: cannot update SecondarySnapshot during a parallel operation
CONTEXT:  SQL statement "SELECT proj4text FROM public.spatial_ref_sys WHERE srid = 4326 LIMIT 1"
parallel worker
LOCATION:  GetLatestSnapshot, snapmgr.c:387