Error: 'matchIter' is not GC-safe as it calls 'insert'
hi i was trying to create a jester app with SQLite as a database, when i try to compile the code with -**-threads:on** compiler throws a error

**code:**
```
post "/api/adddomain":
      var domain = parseJson(request.body)
      var domains =   domain.to(Domain)
      var ins = Monitor(domain: domains.domain ,discard_webhook:domains.hook)
      try:
          dbConn.insert(ins)
          var jsonResp = $(%*{"message": "success","id":ins.id,"domain":domains.domain,"hook":domains.hook})
          resp Http200, jsonResp

var jester1 = initJester()
jester1.serve()
```

**error when i compile with --threads:on**
`sr/lib/nim/pure/asyncmacro.nim(200, 31) Error: 'matchIter' is not GC-safe as it calls 'insert'`