ignore invalid session id missing ":"

While passing an invalid session id missing only a ":" (such as "7323A255B32B39E814D3A3B4D441D24264B15"), Hunchentoot occur an error like this:
<pre><code>[ERROR]] Error when creating REQUEST object: error while parsing arguments to DESTRUCTURING-BIND:
    invalid number of elements in
        ("7323A255B32B39E814D3A3B4D441D24264B15")
    to satisfy lambda list
        (HUNCHENTOOT::ID-STRING
         HUNCHENTOOT::SESSION-STRING):
    exactly 2 expected, but 1 found</code></pre>
It is better to ignore the session id rather than occur an error.