Recreated on Foswiki Sandbox. See http://trunk.foswiki.org/Sandbox/TestAlternateTocTopic

The problem appears to be caused in Macros/TOC.pm The Meta $topicObject loaded for the alternate topic returns null string for the topic text. I've committed a unit test that exposes the problem.

Use of uninitialized value in pattern match (m//) at /usr/home/trunk.foswiki.org/core/lib/Foswiki.pm line 2656.
 at /usr/local/lib/perl5/5.8.8/CGI/Carp.pm line 314
   CGI::Carp::realdie('Use of uninitialized value in pattern match (m//) at /usr/hom...') called at /usr/local/lib/perl5/5.8.8/CGI/Carp.pm line 385
   CGI::Carp::die('Use of uninitialized value in pattern match (m//) at /usr/hom...') called at /usr/home/trunk.foswiki.org/core/lib/Foswiki.pm line 134
   Foswiki::__ANON__('Use of uninitialized value in pattern match (m//) at /usr/hom...') called at /usr/home/trunk.foswiki.org/core/lib/Foswiki.pm line 2656
   Foswiki::takeOutBlocks('undef', 'verbatim', 'HASH(0x238a368)') called at /usr/home/trunk.foswiki.org/core/lib/Foswiki/Render.pm line 2005
   Foswiki::Render::renderTOC('Foswiki::Render=HASH(0x14b3618)', 'undef', 'Foswiki::Meta=HASH(0x2505128)', 'Foswiki::Attrs=HASH(0x24df6b8)', 0) called at /usr/home/trunk.foswiki.org/core/lib/Foswiki/Macros/TOC.pm line 60
   Foswiki::TOC('Foswiki=HASH(0xda37b8)', '%TOC{"System.PatternSkinCustomization"}%\x{a}\x{a}-- Main.GeorgeClark...', 'Foswiki::Meta=HASH(0x13d6038)', '"System.PatternSkinCustomization"') called at /usr/home/trunk.foswiki.org/core/lib/Foswiki.pm line 3122
   Foswiki::expandMacros('Foswiki=HASH(0xda37b8)', '%TOC{"System.PatternSkinCustomization"}%\x{a}\x{a}-- Main.GeorgeClark...', 'Foswiki::Meta=HASH(0x13d6038)') called at /usr/home/trunk.foswiki.org/core/lib/Foswiki/Meta.pm line 2595
   Foswiki::Meta::expandMacros('Foswiki::Meta=HASH(0x13d6038)', '%TOC{"System.PatternSkinCustomization"}%\x{a}\x{a}-- Main.GeorgeClark...') called at /usr/home/trunk.foswiki.org/core/lib/Foswiki/UI/View.pm line 406
   Foswiki::UI::View::_prepare('%TOC{"System.PatternSkinCustomization"}%\x{a}\x{a}-- Main.GeorgeClark...', 'Foswiki::Meta=HASH(0x13d6038)', 0) called at /usr/home/trunk.foswiki.org/core/lib/Foswiki/UI/View.pm line 386
   Foswiki::UI::View::view('Foswiki=HASH(0xda37b8)') called at /usr/home/trunk.foswiki.org/core/lib/Foswiki/UI.pm line 303
   Foswiki::UI::__ANON__() called at /usr/local/lib/perl5/site_perl/5.8.8/Error.pm line 415
   eval {...} called at /usr/local/lib/perl5/site_perl/5.8.8/Error.pm line 407
   Error::subs::try('CODE(0xd599c8)', 'HASH(0xda3498)') called at /usr/home/trunk.foswiki.org/core/lib/Foswiki/UI.pm line 411
   Foswiki::UI::_execute('Foswiki::Request=HASH(0xd59ea8)', 'CODE(0xd59a68)', 'view', 1) called at /usr/home/trunk.foswiki.org/core/lib/Foswiki/UI.pm line 270
   Foswiki::UI::handleRequest('Foswiki::Request=HASH(0xd59ea8)') called at /usr/home/trunk.foswiki.org/core/lib/Foswiki/Engine/CGI.pm line 29
   Foswiki::Engine::CGI::run('Foswiki::Engine::CGI=HASH(0x8f5ad8)') called at /home/trunk.foswiki.org/core/bin/view line 45.

-- GeorgeClark - 12 May 2010

TOC.pm reversed the Web and Topic names when calling normalizeWebTopicName - fixed.

-- GeorgeClark - 13 May 2010