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Postgresql index, autovacuum error

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Need your helping hand.

We are facing below error in my postgres 9.2 production database. Please help us how to resolve and why we are facing this issue and impact of the issue.

ERROR:  right sibling's left-link doesn't match: block 5 links to 8 instead of expected 2 in index "pg_toast_2619_index"

CONTEXT:  automatic vacuum of table "qovr.pg_toast.pg_toast_2619"

Solution:
May be becouse of corrupted index. Try reindex on table qovr. If it didn't help. Try to drop and create index on the same table then perform vacuum and analyze.
Try
REINDEX TABLE pg_statistic;

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