From 8335401bc35eace8a47a892d1cc60a5fe8f37abd Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Thu, 14 Nov 2013 09:25:27 -0600
Subject: [PATCH] update: guard against nil in tap migrations

---
 Library/Homebrew/cmd/update.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/cmd/update.rb b/Library/Homebrew/cmd/update.rb
index 709e138ba9..6e340e3c40 100644
--- a/Library/Homebrew/cmd/update.rb
+++ b/Library/Homebrew/cmd/update.rb
@@ -59,7 +59,9 @@ module Homebrew extend self
     # automatically tap any migrated formulae's new tap
     report.select_formula(:D).each do |f|
       next unless (HOMEBREW_CELLAR/f).exist?
-      tap_user, tap_repo = TAP_MIGRATIONS[f].split '/'
+      migration = TAP_MIGRATIONS[f]
+      next unless migration
+      tap_user, tap_repo = migration.split '/'
       begin
         install_tap tap_user, tap_repo
       rescue AlreadyTappedError => e