Two Blocked Session - Not Getting Sqltext

I have two blocked session

select 'SID ' || l1.sid ||' is blocking ' || l2.sid blocking from v$lock l1, v$lock l2
where l1.block =1 and l2.request > 0 and l1.id1=l2.id1 and l1.id2=l2.id2;

BLOCKING
--------------------------------------------------------------------------------------------------
SID 142 is blocking 241

SQL> select sid,SERIAL# from v$session where sid in (142,241);
SID SERIAL#
---------- ----------
142 40643
241 16500

Now if I am trying to find what exactly getting executed under those two sid I get info for only one.

SQL> select a.SQL_ID,a.SQL_TEXT from v$sqltext a, v$session b where a.ADDRESS=b.SQL_ADDRESS and a.HASH_VALUE=b.SQL_HASH_VALUE and b.sid=241;
SQL_ID SQL_TEXT
------------- ----------------------------------------------------------------
d11mmj6wj4046 DELETE FROM OTABATCHEPTTABLE WHERE EPT_ID=0001471142180000002

BUT FOR OTHER SID I DONT HAVE ANY ENTRY IN SQLTEXT

SQL> select a.SQL_ID,a.SQL_TEXT from v$sqltext a, v$session b where a.ADDRESS=b.SQL_ADDRESS and a.HASH_VALUE=b.SQL_HASH_VALUE and b.sid=142;
no rows selected

FIND OUT WHAT EXACTLY ITS RUNNING AND WHY I AM NOT GETTING THE SQLTEXT FOR A SID?