in hot standby database execute select * from pg_class indicate error

hello:
   i execute any operation in hot standby database,it indicates that index
pg_class_relname_nsp_index contains unexpected zero page at block 0,please
reindex it.but hot standby server ,it only allow read,not write,
  i connect to primary server,i can execute any operation.
  standby connects to primary using streaming replication,it has
synchronous.
 my database server is=EF=BC=9A9.1.2=20
 machine is :linux 5.4 64bit.
i know that i can recreate standby database,it can work.
is there  others ways!
thanks!

=20=20=20

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