--- Coro-Mysql/Mysql.pm	2011/02/17 02:05:14	1.9
+++ Coro-Mysql/Mysql.pm	2012/07/26 21:38:00	1.12
@@ -102,7 +102,7 @@
 sub writable { &Coro::Handle::FH::writable }
 
 BEGIN {
-   our $VERSION = '1.02';
+   our $VERSION = '1.2';
 
    require XSLoader;
    XSLoader::load Coro::Mysql::, $VERSION;
@@ -121,12 +121,17 @@
 returned unchanged. That means it is harmless when applied to database
 handles of other databases.
 
+It is also safe to pass C<undef>, so code like this is works as expected:
+
+   my $dbh = DBI->connect ($database, $user, $pass)->Coro::Mysql::unblock
+      or die $DBI::errstr;
+
 =cut
 
 sub unblock {
    my ($DBH) = @_;
 
-   if ($DBH->{Driver}{Name} eq "mysql") {
+   if ($DBH && $DBH->{Driver}{Name} eq "mysql") {
       my $sock = $DBH->{sock};
 
       open my $fh, "+>&" . $DBH->{sockfd}
@@ -137,7 +142,7 @@
          $fh = Coro::Handle::unblock ($fh);
       }
 
-      _patch $sock, $DBH->{sockfd}, $fh, tied ${$fh};
+      _patch $sock, $DBH->{sockfd}, $DBH->{mysql_clientversion}, $fh, tied ${$fh};
    }
 
    $DBH