[Qemu-devel] qobject/qjson.c:69: failed assertion `obj != NULL'

[G 3]

When I try to use qemu-system-i386, I see this error message:

qobject/qjson.c:69: failed assertion `obj != NULL'.

This is the function where the assertion fails:

/*
 * IMPORTANT: This function aborts on error, thus it must not
 * be used with untrusted arguments.
 */
QObject *qobject_from_jsonf(const char *string, ...)
{
    QObject *obj;
    va_list ap;

    va_start(ap, string);
    obj = qobject_from_jsonv(string, &ap);
    va_end(ap);

    assert(obj != NULL);
    return obj;
}

The string argument is this: { 'seconds': %qd, 'microseconds': %qd }

Would anyone know how to fix this problem?