Postgres pg_dump - postgresql

Question

My automated pg_dump process has been failing when attempting to backup a postgres database. The error message I'm receiving:
ERROR Message:
pg_dump: Error message from server: ERROR: invalid memory alloc
request size 1249770967 pg_dump: The command was: COPY
public.data_store (id, length, last_modified, data) TO stdout;
Custom backup of jackrabbit pg_dump: SQL command failed pg_dump: Error
message from server: ERROR: invalid memory alloc request size
1249770967 pg_dump: The command was: COPY public.data_store
(id, length, last_modified, data) TO stdout; [!!ERROR!!] Failed to
produce custom backup database jackrabbit Plain backup of pdi_logging
Custom backup of pdi_logging Plain backup of postgres Custom backup of
postgres Plain backup of quartz Custom backup of quartz
Based on my findings everything seemed to point to corrupt data in the table so I created a function to query the table and extract the ctid so I then may find the culprit and delete the corrupt row.
Function:
CREATE OR REPLACE FUNCTION find_bad_row(tablename text)
RETURNS tid AS
$BODY$
DECLARE
result tid;
curs REFCURSOR;
row1 RECORD;
row2 RECORD;
tabName TEXT;
count BIGINT := 0;
BEGIN
SELECT reverse(split_part(reverse($1), '.', 1)) INTO tabName;
OPEN curs FOR EXECUTE 'SELECT ctid FROM ' || tableName;
count := 1;
FETCH curs INTO row1;
WHILE row1.ctid IS NOT NULL LOOP
result = row1.ctid;
count := count + 1;
FETCH curs INTO row1;
EXECUTE 'SELECT (each(hstore(' || tabName || '))).* FROM '
|| tableName || ' WHERE ctid = $1' INTO row2
USING row1.ctid;
IF count % 100000 = 0 THEN
RAISE NOTICE 'rows processed: %', count;
END IF;
END LOOP;
CLOSE curs;
RETURN row1.ctid;
EXCEPTION
WHEN OTHERS THEN
RAISE NOTICE 'LAST CTID: %', result;
RAISE NOTICE '%: %', SQLSTATE, SQLERRM;
RETURN result;
END
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION find_bad_row(text)
OWNER TO pentaho;
After calling the function select find_bad_row('public.data_store'), the result given was (0,2). I searched the table for said ctid, select ctid, * from public.data_store, and deleted the preceding row. I then executed my pg_dump script and received the same error. Re-running the function on the table returns a result again of the first row. Being new to postgres is my approach altogether wrong and is there another way to resolve this? Could it be that the entire table is corrupt?