ERROR on database index

Hello. 
This morning the logs are showing me this error when I make a connection with 
an specific database.

[
ERROR:  index "pg_proc_proname_args_nsp_index" contains unexpected zero page 
at block 16 at character 61 
]

I create a new database but I don't know where to find the origin of the 
problem, or how to avoid this. Any idea would be helpful.

Thanks