node.js - Socket.IO - Message sent from client is failing on server and client -

i working on realtime data communication platform uses socket.io connect server client. server running node.js, , client desktop application in form of webpage using atom's electron.

i receiving messages on client well, when try , send message, through format:

window.socket.emit('embed',{'...'}); 

the server triggers error handler:

socket.on('error',function(err) {     console.log('client error: '+json.stringify(err)); }); 

i see in log:

client error: {} 

debugging socket.io on client side reveals logs when message sent:

[14184:0511/184052:info:console(1)] "socket.io-client:manager writing packet %j +10s", source: https://cdn.socket.io/socket.io-1.3.5.js (1) [14184:0511/184052:info:console(1)] "socket.io-parser encoding packet %j +819ms", source: https://cdn.socket.io/socket.io-1.3.5.js (1) [14184:0511/184052:info:console(1)] "socket.io-parser encoded %j %s +0ms", source: https://cdn.socket.io/socket.io-1.3.5.js (1) [14184:0511/184052:info:console(2)] "%cengine.io-client:socket %cflushing %d packets in socket%c +820ms", source: https://cdn.socket.io/socket.io-1.3.5.js (2) 

any clues why might occuring?

edit:

both client , server running socket.io version 1.3.5.

also, attempting log error object using console.log results in line in console:

[typeerror: property 'undefined' of object #<object> not function] 

i assume that function bound error event on server not designed accept error object.

edit:

server side, code executed begin socket.io connection.

var io = require('socket.io')(1415);  io.on('connection',function(socket) {     console.log('connection');      socket.on('error',function(err) {         console.log('client error: '+json.stringify(err));         console.log(err);     });      socket.on('embed',function(obj) {         var type = obj.type;         var id = obj.id;         console.log('--------------------------------------------');         // ...         // additional application logic     }); }); 

client side, code run:

window.socket = io('http://localhost:1415');  // when message emitted, code run. code run on delay, , after messages have been received, assume connection established function(id) {     var type = gettype(id);     window.socket.emit('embed',{id:id,type:type}); }(); 

edit (again):

other messages can sent , received successfully.

inspecting raw network data through web inspector network panel reveals this: