Got an error ' Attempt to request non-existent socket'

[taibang]

we created a room in hubl.in and we can see each other, but I get errors from backend,
error: WebRTC: [QXRWX1TTR6s9qVAz] General message error. Message ignored. Connection Warning: Attempt to request non-existent socket: '/#UFob_VyoJmNEIiB-AAAP'
at Object.appObj.connection (/root/hublin/node_modules/easyrtc/lib/easyrtc_public_obj.js:1516:26)
at async.waterfall.targetConnectionObj (/root/hublin/node_modules/easyrtc/lib/easyrtc_default_event_listeners.js:642:48)
at fn (/root/hublin/node_modules/easyrtc/node_modules/async/lib/async.js:582:34)
at Immediate. (/root/hublin/node_modules/easyrtc/node_modules/async/lib/async.js:498:34)
at runCallback (timers.js:789:20)
at tryOnImmediate (timers.js:751:5)
at processImmediate [as _immediateCallback] (timers.js:722:5)

could someone give me some points how fix this bug?thanks!