Sometimes a websocket message from Espruino WiFi is invalid UTF-8? Crashes the connection.

I'm not sure if this has anything to do with it, but I'm getting a bunch of errors in the Espruino console:

 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v91 Copyright 2016 G.Williams
>
=undefined
IP: 192.168.43.247
{
  "connect": function (a,c) {return new b(a,c)}
 }
[WS] "Hello to Espruino!"
Uncaught InternalError: Timeout on I2C Read Receive
 at line 1 col 66
...is.i2c.readFrom(this.addr,6);a=c[0]<<8|c[1];var b=c[2]<<8|c[...
                              ^
in function "readSXYZ" called from line 1 col 17
this.readSXYZ(67)
                ^
in function "getRotation" called from line 1 col 36
...is;return this.getRotation().map(function(c){return c/a.gyro...
                              ^
in function "getDegreesPerSecond" called from line 5 col 51
...n: mpu.getDegreesPerSecond(), // returns gyro array in degre...
                              ^
in function called from system
ERROR: Out of Memory!
Execution Interrupted
Execution Interrupted
Execution Interrupted
Execution Interrupted
Uncaught InternalError: Timeout on I2C Read Receive
 at line 1 col 66
...is.i2c.readFrom(this.addr,6);a=c[0]<<8|c[1];var b=c[2]<<8|c[...
                              ^
in function "readSXYZ" called from line 1 col 17
this.readSXYZ(59)
                ^
in function "getAcceleration" called from line 1 col 40
...eturn this.getAcceleration().map(function(c){return c/a.acc_...
                              ^
in function "getGravity" called from line 3 col 46
...celeration: mpu.getGravity(),  // returns acceleration array...
                              ^
in function called from system
Execution Interrupted
Execution Interrupted
Execution Interrupted
Execution Interrupted
Execution Interrupted
Execution Interrupted
ERROR: Ctrl-C while processing interval - removing it.
Execution Interrupted during event processing.
at line 1 col 66
...is.i2c.readFrom(this.addr,6);a=c[0]<<8|c[1];var b=in function "getRotation" called from line 1 col 36
...is;return this.getRotation().in function "getDegrees" called fromin function called from system
>