X window system error when calling XInternAtom

[Oinos]

This is an error that I and one or two more people are experiencing when trying to run SFML (http://www.sfml-dev.org/), integrated in WxWidgets (https://www.wxwidgets.org/) on Linux. The error ocurrs during the creation of a SFML window.

Here are the specs common to both of us:
gtk version 2
sfml version > 2.4
wxwidgets version 3.0.2
32 bit system
I'm on Ubuntu 14.04, don't know about them.

Here's the error message we both get:

The program 'MAGEditor' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadAccess (attempt to access private resource denied)'.
(Details: serial 54 error_code 10 request_code 2 minor_code 0)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the --sync command line
option to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
AL lib: ReleaseALC: 1 device not closed
The only difference is that serial can be 54, 45 or 52.

And here's the relevant part of the backtrace the other guy posted: (I myself couldn't make a backtrace for some reason)


#0 0x00007ffff4ec7770 in gdk_x_error (display=0x75d000, error=0x7fffffffdec0) at gdkmain-x11.c:458
#1 0x00007fffeff476fd in _XError (dpy=dpy@entry=0x75d000, rep=rep@entry=0x9c3db0) at XlibInt.c:1434
#2 0x00007fffeff44627 in handle_error (dpy=0x75d000, err=0x9c3db0, in_XReply=<optimized out>) at xcb_io.c:199
#3 0x00007fffeff446e5 in handle_response (dpy=0x75d000, response=0x9c3db0, in_XReply=<optimized out>)
at xcb_io.c:311
#4 0x00007fffeff455f8 in _XReply (dpy=dpy@entry=0x75d000, rep=rep@entry=0x7fffffffe0a0, extra=extra@entry=0, discard=discard@entry=1) at xcb_io.c:621
#5 0x00007fffeff302ff in XInternAtom (dpy=dpy@entry=0x75d000, name=0x7fffffffe1c0 "WM_PROTOCOLS", onlyIfExists=onlyIfExists@entry=0) at IntAtom.c:181
Further below it just continues with:

#6 sf::priv::getAtom(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool)
#7 sf::priv::WindowImplX11::setProtocols()
#8 sf::priv::WindowImplX11::WindowImplX11(unsigned long)
#9 sf::priv::WindowImpl::create(unsigned long)
#10 sf::Window::create(unsigned long, sf::ContextSettings const&)
return reply->atom;
}
And all those seem to be fine.

SFML is open source, so here's where it calls XInternAtom (although, for some reason, under another name):


xcb_atom_t getAtom(const std::string& name, bool onlyIfExists)
{
AtomMap::const_iterator iter = atoms.find(name);

if (iter != atoms.end())
return iter->second;

ScopedXcbPtr<xcb_generic_error_t> error(NULL);

xcb_connection_t* connection = OpenConnection();

ScopedXcbPtr<xcb_intern_atom_reply_t> reply(xcb_intern_atom_reply(
connection,
xcb_intern_atom(
connection,
onlyIfExists,
name.size(),
name.c_str()
),
&error
));

CloseConnection(connection);

if (error || !reply)
{
err() << "Failed to get " << name << " atom." << std::endl;
return XCB_ATOM_NONE;
}

atoms[name] = reply->atom;

return reply->atom;
}
This is called from:

void WindowImplX11::setProtocols()
{
xcb_atom_t wmProtocols = getAtom("WM_PROTOCOLS"); //this very first line gives the error.
//...


I tried reading the documentation of XInternAtom and when it throws errors, but this didn't help me with indentifying the problem. Trying to search for X window system error was even less successful - the search returned all sorts of results, but none relevantly close to mine.

What could be the cause of this problem?