I was getting this when I ran “brew update” after a long time:
antonperez-mbpro:~ anton.perez$ brew update
Checking out files: 100% (2942/2942), done.
Error: undefined method `to_sym’ for nil:NilClass
Please report this bug:
https://github.com/mxcl/homebrew/wiki/troubleshooting
/usr/local/Library/Homebrew/cmd/update.rb:112:in `report’
/usr/local/Library/Homebrew/cmd/update.rb:110:in `each_line’
/usr/local/Library/Homebrew/cmd/update.rb:110:in `report’
/usr/local/Library/Homebrew/cmd/update.rb:26:in `update’
/usr/local/Library/brew.rb:87:in `send’
/usr/local/Library/brew.rb:87
All I did was run it again and it worked. If it doesn’t work for you, do a “brew doctor” to continue troubleshooting.