JSON.parse problem in construct2-r103.2-setup_3404

"Javascript error!

SyntaxError: JSON.parse: unexpected character

localhost/My_plugin.js, line 134"

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I develop my Own plugin to connect my Gamer to server via webSocket. Everything working very smooth and stable in r95. But runtime err appear after I upgrade to r103.2.3404349. I did try the test but could not define problem. For example: If I write only JSON testing with bellow JavaScript code, it is working ok:

<font color=blue>var _data = '{"firstName":"John" , "lastName":"Doe"}';

var obj = JSON.parse(_data);                     

alert(obj.firstName);</font>

Once connect to my webSocket server, bellow message popup:

<font color=red>"Javascript error!

SyntaxError: JSON.parse: unexpected character localhost/My_plugin.js, line 134"</font>

But actually with R95 - this problem never happen.

My server using windown2003 and websocket server base on Fleck at:

github.com/statianzo/Fleck

Please help me..I don't wanna stay slickly in R95 forever...:(.

Best regard..

PS: the declaration of websocket in my own plug in like that

<font color=blue>

if(typeof(WebSocket) == "undefined" && typeof(MozWebSocket) == "undefined")

return;

var socket = this.socket;

wsImpl = window.WebSocket || window.MozWebSocket;</font>