select table indicate missing chunk number 0 for toast value 96635 in pg_toast_2619

hello:
   i see a lot ,"missing chunk number 0 for toast value 96635 in
pg_toast_2619",,,,,," in background aler log.select * from iclock ,no data
retrun,indicate  missing chunk number 0 for toast value 96635 in
pg_toast_2619.
    i use pg_dump table,then truncate table,then pg_dump it current
database,i still return this error,
but i pg_dump it to others database,i can work.
   i deal with pg_dump the whole database,then pg_dump to new database,it
can work.
   i want to know what reason it can happen? and another ways to deal with
it ?
   thanks.

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