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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