formula_installer: handle nil req_dependency.

Closes #3538.
2017-12-07 16:17:55 +00:00 · 2017-12-07 16:17:55 +00:00 · 4ca9831da6
commit 4ca9831da6
parent 34b03dea52
1 changed files with 1 additions and 1 deletions
--- 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)