From 79441447f8ee153adcdaebb7325e05516914c784 Mon Sep 17 00:00:00 2001
From: Bo Anderson <mail@boanderson.me>
Date: Sun, 5 Nov 2023 00:57:33 +0000
Subject: [PATCH] formula_auditor: handle nil tap

---
 Library/Homebrew/formula_auditor.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/formula_auditor.rb b/Library/Homebrew/formula_auditor.rb
index 51a72b1c41..d0eb413d0c 100644
--- a/Library/Homebrew/formula_auditor.rb
+++ b/Library/Homebrew/formula_auditor.rb
@@ -318,7 +318,11 @@ module Homebrew
 
           next unless @core_tap
 
-          unless dep_f.tap.core_tap?
+          if dep_f.tap.nil?
+            problem <<~EOS
+              Dependency '#{dep.name}' does not exist in any tap.
+            EOS
+          elsif !dep_f.tap.core_tap?
             problem <<~EOS
               Dependency '#{dep.name}' is not in homebrew/core. Formulae in homebrew/core
               should not have dependencies in external taps.