remote exception: stream disconnected prematurely

sometime i run app grain error, chrome show: "did't not send any data" status & i found some issue in sandstorm log file. like that: `remote exception: stream disconnected prematurely: => awaited here: at Promise.await (/programs/server/npm/node_modules/meteor/promise/node_modules/meteor-promise/promise_server.js:60:12) at getUiViewAndUserInfo (server/gateway-router.js:212:20) at inMeteor (server/gateway-router.js:311:36) at inMeteorInternal (imports/server/async-helpers.js:24:17) at Meteor.bindEnvironment.callback (imports/server/async-helpers.js:12:3) at runWithEnvironment (packages/meteor.js:1356:24) at packages/meteor.js:1369:14 at Promise (imports/server/async-helpers.js:22:5) at new Promise () at inMeteor (imports/server/async-helpers.js:21:10) at GatewayRouterImpl.openUiSession (server/gateway-router.js:266:12) at /node_modules/capnp.js:174:21 at /programs/server/npm/node_modules/meteor/promise/node_modules/meteor-promise/fiber_pool.js:43:40

Unhandled exception in Promise: { Error: remote exception: stream disconnected prematurely cppFile: '(remote)', line: 0, kjType: 'disconnected' } ` What kind of this error? how i can fix it? thanks