Parse.com + Unity WebGL error - parse-platform

Question

I have an issue with parse + unity in WebGL, it works perfectly in android or pc, but when i test in web this error appears
exception thrown: SyntaxError: Failed to execute 'setRequestHeader' on 'XMLHttpRequest': 'sme 0' is not a valid HTTP header field value.,Error: Failed to execute 'setRequestHeader' on 'XMLHttpRequest': 'sme 0' is not a valid HTTP header field value.
at Error (native)
at _JS_WebRequest_SetRequestHeader (http://localhost:60265/Release/Web.js:1:299623)
at aAg (http://localhost:60265/Release/Web.js:28:772491)
at YBc (http://localhost:60265/Release/Web.js:23:638406)
at Array.Are (http://localhost:60265/Release/Web.js:24:499286)
at U4p (http://localhost:60265/Release/Web.js:5:760172)
at Z4p (http://localhost:60265/Release/Web.js:5:770191)
at bXo (http://localhost:60265/Release/Web.js:9:582682)
at Array.vWo (http://localhost:60265/Release/Web.js:9:501983)
at Array.dap (http://localhost:60265/Release/Web.js:9:944092)Module.printErr # (index):34Browser.mainLoop.runIter # Web.js:1Browser_mainLoop_runner # Web.js:1
Do you know if this is a bug?
I'm using a personal edition of unity
It was tested in chrome and firefox, in both cases appears an error
EDITED
this code breaks the WebGL game
ParseUser.LogInAsync ("aaaaaa", "bbbbbb").ContinueWith (t => {
if (t.IsFaulted || t.IsCanceled){
ParseUser user = new ParseUser ();
user ["username"] = "aaaaaa";
user ["password"] = "bbbbbb";
ParseUser.LogOutAsync().ContinueWith(c=>{
user.SignUpAsync().ContinueWith(b =>{
if (b.IsFaulted || b.IsCanceled){
print ("signup fail");
}else{
print ("signup success");
}
});
});
}else{
print ("login success");
}
});