version used for the session; this number matches the constants I<e.g.>
B<TLS1_VERSION> or B<TLS1_2_VERSION>.
-If the function is passed the NULL pointer for the session B<s>, 0 is returned.
+Note that the SSL_SESSION_get_protocol_version() function
+does B<not> perform a null check on the provided session B<s> pointer.
=head1 SEE ALSO