From 10a378c5a20b685f4c65884a93dde431452a4fb4 Mon Sep 17 00:00:00 2001
From: Guy Bedford <guybedford@gmail.com>
Date: Sat, 18 Sep 2021 11:57:52 -0700
Subject: [PATCH] module: fix ERR_REQUIRE_ESM for parentPath null

---
 lib/internal/errors.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/internal/errors.js b/lib/internal/errors.js
index 84431fe811d9fc..755f1b2b86176d 100644
--- a/lib/internal/errors.js
+++ b/lib/internal/errors.js
@@ -1459,8 +1459,8 @@ E('ERR_REQUIRE_ESM',
       return msg;
     }
     const path = require('path');
-    const basename = path.basename(filename) === path.basename(parentPath) ?
-      filename : path.basename(filename);
+    const basename = parentPath && path.basename(filename) ===
+      path.basename(parentPath) ? filename : path.basename(filename);
     if (hasEsmSyntax) {
       msg += `\nInstead change the require of ${basename} in ${parentPath} to` +
         ' a dynamic import() which is available in all CommonJS modules.';