task._ref throws an error when the typed task doesn't exist.

The task._ref instruction throws an error when the typed task doesn't exist.
/usr/local/share/npm/lib/node_modules/ralio/lib/ralio.js:196
          _ref: task._ref,
                    ^
TypeError: Cannot read property '_ref' of undefined
    at Ralio.setTaskState (/usr/local/share/npm/lib/node_modules/ralio/lib/ralio.js:196:21)
    at Request.Ralio.bulk [as _callback] (/usr/local/share/npm/lib/node_modules/ralio/lib/ralio.js:54:7)
    at Request.init.self.callback (/usr/local/share/npm/lib/node_modules/ralio/node_modules/request/main.js:120:22)
    at Request.EventEmitter.emit (events.js:99:17)
    at Request.<anonymous> (/usr/local/share/npm/lib/node_modules/ralio/node_modules/request/main.js:555:16)
    at Request.EventEmitter.emit (events.js:96:17)
    at IncomingMessage.Request.start.self.req.self.httpModule.request.buffer (/usr/local/share/npm/lib/node_modules/ralio/node_modules/request/main.js:517:14)
    at IncomingMessage.EventEmitter.emit (events.js:126:20)
    at IncomingMessage._emitEnd (http.js:366:10)
    at HTTPParser.parserOnMessageComplete [as onMessageComplete] (http.js:149:23)