diff --git a/Library/Homebrew/utils/pypi.rb b/Library/Homebrew/utils/pypi.rb
index d69291b069814b3ab037261fdced6cece6a4b29d..d1cffdfd36a2ebd5539ab959647880c32813cc1d 100644
--- a/Library/Homebrew/utils/pypi.rb
+++ b/Library/Homebrew/utils/pypi.rb
@@ -130,7 +130,7 @@ module PyPI
   def update_python_resources!(formula, version: nil, package_name: nil, extra_packages: nil, exclude_packages: nil,
                                print_only: false, silent: false, ignore_non_pypi_packages: false)
 
-    auto_update_list = formula.tap.pypi_formula_mappings
+    auto_update_list = formula.tap&.pypi_formula_mappings
     if auto_update_list.present? && auto_update_list.key?(formula.full_name) &&
        package_name.blank? && extra_packages.blank? && exclude_packages.blank?