diff --git a/Library/Homebrew/formula_auditor.rb b/Library/Homebrew/formula_auditor.rb
index 5be43238e6..9fa5600bf7 100644
--- a/Library/Homebrew/formula_auditor.rb
+++ b/Library/Homebrew/formula_auditor.rb
@@ -567,6 +567,7 @@ module Homebrew
 
     def audit_eol
       return unless @online
+      return unless @core_tap
 
       return if formula.deprecated? || formula.disabled?