From 7e31574c3f23fdb2c27ab5d7d552e49792d0bddb Mon Sep 17 00:00:00 2001
From: hyuraku <32809703+hyuraku@users.noreply.github.com>
Date: Mon, 6 Jun 2022 21:03:39 +0900
Subject: [PATCH] avoid nil error

---
 Library/Homebrew/utils/ast.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/utils/ast.rb b/Library/Homebrew/utils/ast.rb
index 679c08f7a6..8132023aef 100644
--- a/Library/Homebrew/utils/ast.rb
+++ b/Library/Homebrew/utils/ast.rb
@@ -199,7 +199,7 @@ module Utils
         return false if install_node.blank?
 
         install_node.each_node.any? do |node|
-          node.send_type? && node.receiver.const_name == "ENV" && node.method_name == :runtime_cpu_detection
+          node.send_type? && node.receiver&.const_name == "ENV" && node.method_name == :runtime_cpu_detection
         end
       end