ERROR: missing chunk number 0 for toast value while using logical decoder.\

I am using PostgresSQL 9.5.0.
I have customized :
https://github.com/michaelpq/pg_plugins/tree/master/decoder_raw to get
result as json. It works fine. suddenly i getting below exception while
consuming or peeking changes through that logical slot.
Does postgres removed the rows needed for that slot??
Kindly help me to find the problem.

db=# select * from pg_logical_slot_get_changes('lslot',NULL,1);
ERROR: missing chunk number 0 for toast value 857563 in pg_toast_782254
CONTEXT: slot "lslot", output plugin "rep_slot", in the change callback,
associated LSN 2E/3C26D6F0

select * from pg_class where relname like 'pg_toast_782254';
-[ RECORD 1 ]-------+----------------
relname | pg_toast_782254
relnamespace | 99
reltype | 782273
reloftype | 0
relowner | 10
relam | 0
relfilenode | 782272
reltablespace | 0
relpages | 464
reltuples | 2066
relallvisible | 464
reltoastrelid | 0
relhasindex | t
relisshared | f
relpersistence | p
relkind | t
relnatts | 3
relchecks | 0
relhasoids | f
relhaspkey | t
relhasrules | f
relhastriggers | f
relhassubclass | f
relrowsecurity | f
relforcerowsecurity | f
relispopulated | t
relreplident | n
relfrozenxid | 1982173
relminmxid | 1
relacl |
reloptions |

Thanks In Advance.

-----
sudalai
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