Socket exceptions in node.js

I keep getting two exceptions on my server that close the process even though the entire script is wrapped in a try catch block. The exceptions are:

events.js:160
throw er; // Unhandled 'error' event
      ^

Error: write EPIPE
    at exports._errnoException (util.js:1022:11)
    at WriteWrap.afterWrite [as oncomplete] (net.js:804:14)

and

Error: invalid opcode: 7
    at Receiver.start (/home/mysite/public_html/node_modules/ws/lib/Receiver.js:211:18)
    at Receiver.add (/home/mysite/public_html/node_modules/ws/lib/Receiver.js:134:14)
    at Socket._ultron.on (/home/mysite/public_html/node_modules/ws/lib/WebSocket.js:139:22)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    at TCP.onread (net.js:551:20)

From the sockets lib.

Does anyone know what is causing this and how to prevent it?

via John