[TxMt] TODO bundle error

[Christopher Brewster]

I am sure this has been discussed before but I cannot track it down.
I get the following error when using the TODO bundle with a latex file:
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Scanning directory: ~/Dropbox/Aston/Research/Papers/Ontology_Evaluation

(erb):4: undefined method `+' for nil:NilClass (NoMethodError) from /Applications/TextMate.app/Contents/SharedSupport/Bundles/TODO.tmbundle/Support/todo.rb:99 from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/erb.rb:716:in `grep' from /Applications/TextMate.app/Contents/SharedSupport/Bundles/TODO.tmbundle/Support/todo.rb:77:in `each' from /Applications/TextMate.app/Contents/SharedSupport/Bundles/TODO.tmbundle/Support/todo.rb:77:in `grep' from /Applications/TextMate.app/Contents/SharedSupport/Bundles/TODO.tmbundle/Support/todo.rb:77 from /Applications/TextMate.app/Contents/SharedSupport/Bundles/TODO.tmbundle/Support/todo.rb:76:in `open' from /Applications/TextMate.app/Contents/SharedSupport/Bundles/TODO.tmbundle/Support/todo.rb:76 from /Applications/TextMate.app/Contents/SharedSupport/Bundles/TODO.tmbundle/Support/todo.rb:75:in `each' from /Applications/TextMate.app/Contents/SharedSupport/Bundles/TODO.tmbundle/Support/todo.rb:75 from /Library/Application Support/TextMate/Support/lib/textmate.rb:201:in `call' from /Library/Application Support/TextMate/Support/lib/textmate.rb:201:in `each_text_file' from /Applications/TextMate.app/Contents/SharedSupport/Bundles/TODO.tmbundle/Support/todo.rb:71
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How can this be fixed?

Thanks,
Christopher