Attempt to visit page not already in log breaks plugin

[CNG]

I installed on a new MT 6.2 using Perl 5.18.2, and attempts to visit nonexistent pages just redirected to the home page. I believe this is due to a change in a recent commit at 25b40fd#diff-de9c034f832ab2db1f5e6f670cef20aeR56

This was the original line:

if ($log->mapping) {

And it was changed to:

if ($log->mapping !~ /$target/) {

But I think it might need to be changed to:

if ($log->mapping && $log->mapping !~ /$target/) {