From 4ca9831da6c1b16f7ea28e32c7c21cf37845c26d Mon Sep 17 00:00:00 2001
From: Mike McQuaid
Date: Thu, 7 Dec 2017 16:17:55 +0000
Subject: formula_installer: handle nil req_dependency.

Closes #3538.
---
 Library/Homebrew/formula_installer.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'Library')

diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 77e0ab29b..32a7a698b 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -449,7 +449,7 @@ class FormulaInstaller
 
         if (req.optional? || req.recommended?) && build.without?(req)
           Requirement.prune
-        elsif req.build? && use_default_formula && req_dependency.installed?
+        elsif req.build? && use_default_formula && req_dependency&.installed?
           Requirement.prune
         elsif install_requirement_formula?(req_dependency, req, install_bottle_for_dependent)
           deps.unshift(req_dependency)
-- 
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