Websharper doing async call returns server error 500

I'm trying to do async db query using SQLProvider and sqlite as db. The server side function looks like this

[Rpc]
let dbAsyncCall () =
    async {
        return! query {
            // ...
        } |> Seq.executeQueryAsync
    } 
    |> Async.StartAsTask 
    |> Async.AwaitTask 

On the client side I call it like this

async {
    let! data = Server.dbAsyncCall ()
    // ...
} |> Doc.Async

When the code gets executed I receive the following error

What's going on?

Thanks!

UPDATE:

Ok, it seems that the problem is somehow related to executing queries on sqlite. I mean if try to do a simple async operation async { return 5}, it gets executed without any problems, but when I do any db related queries and surround it with async, I receive the error. I know that SQLProvider supports async queries, maybe the problem with sqlite lib itself?

UPDATE 2:

What error shows js side