From 6a12794b1107d06a903b258c84a7690ec1ef093e Mon Sep 17 00:00:00 2001
From: Tobias Koppers <tobias.koppers@googlemail.com>
Date: Wed, 10 Nov 2021 09:06:31 +0100
Subject: [PATCH 1/2] check hooks for existance before using in ProfilingPlugin

---
 lib/debug/ProfilingPlugin.js | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/lib/debug/ProfilingPlugin.js b/lib/debug/ProfilingPlugin.js
index fa3d266527c..8f8dcaac814 100644
--- a/lib/debug/ProfilingPlugin.js
+++ b/lib/debug/ProfilingPlugin.js
@@ -203,15 +203,17 @@ class ProfilingPlugin {
 
 		// Compiler Hooks
 		Object.keys(compiler.hooks).forEach(hookName => {
-			compiler.hooks[hookName].intercept(
-				makeInterceptorFor("Compiler", tracer)(hookName)
-			);
+			const hook = compiler.hooks[hookName];
+			if (hook) {
+				hook.intercept(makeInterceptorFor("Compiler", tracer)(hookName));
+			}
 		});
 
 		Object.keys(compiler.resolverFactory.hooks).forEach(hookName => {
-			compiler.resolverFactory.hooks[hookName].intercept(
-				makeInterceptorFor("Resolver", tracer)(hookName)
-			);
+			const hook = compiler.resolverFactory.hooks[hookName];
+			if (hook) {
+				hook.intercept(makeInterceptorFor("Resolver", tracer)(hookName));
+			}
 		});
 
 		compiler.hooks.compilation.tap(
@@ -303,7 +305,7 @@ const interceptAllHooksFor = (instance, tracer, logLabel) => {
 	if (Reflect.has(instance, "hooks")) {
 		Object.keys(instance.hooks).forEach(hookName => {
 			const hook = instance.hooks[hookName];
-			if (!hook._fakeHook) {
+			if (hook && !hook._fakeHook) {
 				hook.intercept(makeInterceptorFor(logLabel, tracer)(hookName));
 			}
 		});

From 11bc877b42954b9912f0573e53416373e954cbd9 Mon Sep 17 00:00:00 2001
From: Tobias Koppers <tobias.koppers@googlemail.com>
Date: Wed, 10 Nov 2021 15:03:44 +0100
Subject: [PATCH 2/2] add test case

---
 test/ProfilingPlugin.test.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/test/ProfilingPlugin.test.js b/test/ProfilingPlugin.test.js
index de3a6766989..f28b3c1d166 100644
--- a/test/ProfilingPlugin.test.js
+++ b/test/ProfilingPlugin.test.js
@@ -25,7 +25,10 @@ describe("Profiling Plugin", function () {
 					new webpack.debug.ProfilingPlugin({
 						outputPath: finalPath
 					})
-				]
+				],
+				experiments: {
+					backCompat: false
+				}
 			});
 			compiler.run(err => {
 				if (err) return done(err);