feedback: API reference | Tarantool

> <…>e also supported.
> 
> 
> 
> Return:
> result of function_name on success
> **|nill|,** err otherwise
> 
> 
> 
> 
> 
> 
>  replicaset_object:callrw(function_name, {<…>

https://www.tarantool.io/en/doc/latest/reference/reference_rock/vshard/vshard_api/#router-api-replicaset-call

We have ill nil here: nill.