Not catching sigsegv

gistfile1.nim

import msgqredis, marshal, cgi, auth, strutils, osproc, streams

var request: TQueuedRequest
var requestStr: string
var c: int = 1

when isMainModule:
  echo("------------- NEW NEW procreq starting up. -------------")
  while true:
    echo("top of while loop " & $c)
    c = c+1
    try:
      requestStr = startProcessing("http")
    except:
      echo("Problem with startProcessing")
    
    if requestStr != nil:
      request = to[TQueuedRequest](requestStr)

      var query: tuple[apikey, user, args: string]

      for k, v in decodeData(request.query):
        query = ( apikey: "", user: "", args: "" )
        case k
        of "apikey":
          query.apikey = v
        of "user":
          query.user = v 
        of "args":
          query.args=v

      #look up api key and check if it matches username
      var user = auth(query.apikey, query.user)

      #if not send bad auth messsage
      if user == nil:
        request.respond("Not authorized", "text/plain")
      else:
        #spawn a child running oicctl process with args from command
        var args = query.args.split(' ')
        args.insert(user, 0)
        var conv = startProcess("./oicctl", "", args)

        proc readStreamToOutput(input) =
          var line: TaintedString = ""

          while input.readLine(line):
            #as child spits out output push it into response queue
            request.respond(line, "text/plain")

          #when child is done push done message to response queue 
          request.respond("{{END}}", "text/plain")
             
          #remove from processing
          discard doneProcessing(requestStr)

        readStreamToOutput(conv.outputStream)