diff --git a/src/api/environment.cc b/src/api/environment.cc
index 635c96c17a2be4..6bc4033b97da5a 100644
--- a/src/api/environment.cc
+++ b/src/api/environment.cc
@@ -370,7 +370,6 @@ Environment* CreateEnvironment(
   Environment* env = new Environment(
       isolate_data, context, args, exec_args, nullptr, flags, thread_id);
 #if HAVE_INSPECTOR
-  // TODO(joyeecheung): handle the exit code returned by InitializeInspector().
   if (env->should_create_inspector()) {
     if (inspector_parent_handle) {
       env->InitializeInspector(
diff --git a/src/env.h b/src/env.h
index 9e72e5541c3a9b..a5b15863574a56 100644
--- a/src/env.h
+++ b/src/env.h
@@ -617,7 +617,7 @@ class Environment : public MemoryRetainer {
 #if HAVE_INSPECTOR
   // If the environment is created for a worker, pass parent_handle and
   // the ownership if transferred into the Environment.
-  ExitCode InitializeInspector(
+  void InitializeInspector(
       std::unique_ptr<inspector::ParentInspectorHandle> parent_handle);
 #endif
 
diff --git a/src/node.cc b/src/node.cc
index c7e20acfaf9aca..d5581e60f3389b 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -166,7 +166,7 @@ void SignalExit(int signo, siginfo_t* info, void* ucontext) {
 #endif  // __POSIX__
 
 #if HAVE_INSPECTOR
-ExitCode Environment::InitializeInspector(
+void Environment::InitializeInspector(
     std::unique_ptr<inspector::ParentInspectorHandle> parent_handle) {
   std::string inspector_path;
   bool is_main = !parent_handle;
@@ -187,7 +187,7 @@ ExitCode Environment::InitializeInspector(
                           is_main);
   if (options_->debug_options().inspector_enabled &&
       !inspector_agent_->IsListening()) {
-    return ExitCode::kInvalidCommandLineArgument2;  // Signal internal error
+    return;
   }
 
   profiler::StartProfilers(this);
@@ -196,7 +196,7 @@ ExitCode Environment::InitializeInspector(
     inspector_agent_->PauseOnNextJavascriptStatement("Break at bootstrap");
   }
 
-  return ExitCode::kNoFailure;
+  return;
 }
 #endif  // HAVE_INSPECTOR
 
diff --git a/src/node_main_instance.cc b/src/node_main_instance.cc
index 6ded80aa05b878..3e0167fdddea12 100644
--- a/src/node_main_instance.cc
+++ b/src/node_main_instance.cc
@@ -181,8 +181,6 @@ NodeMainInstance::CreateMainEnvironment(ExitCode* exit_code) {
     SetIsolateErrorHandlers(isolate_, {});
     env->InitializeMainContext(context, &(snapshot_data_->env_info));
 #if HAVE_INSPECTOR
-    // TODO(joyeecheung): handle the exit code returned by
-    // InitializeInspector().
     env->InitializeInspector({});
 #endif
 
@@ -201,8 +199,6 @@ NodeMainInstance::CreateMainEnvironment(ExitCode* exit_code) {
                               EnvironmentFlags::kDefaultFlags,
                               {}));
 #if HAVE_INSPECTOR
-    // TODO(joyeecheung): handle the exit code returned by
-    // InitializeInspector().
     env->InitializeInspector({});
 #endif
     if (env->principal_realm()->RunBootstrapping().IsEmpty()) {
diff --git a/src/node_snapshotable.cc b/src/node_snapshotable.cc
index 6a6b899cb83529..a5fda9aa5a3833 100644
--- a/src/node_snapshotable.cc
+++ b/src/node_snapshotable.cc
@@ -1173,8 +1173,6 @@ ExitCode SnapshotBuilder::Generate(SnapshotData* out,
       // in the future).
       if (snapshot_type == SnapshotMetadata::Type::kFullyCustomized) {
 #if HAVE_INSPECTOR
-        // TODO(joyeecheung): handle the exit code returned by
-        // InitializeInspector().
         env->InitializeInspector({});
 #endif
         if (LoadEnvironment(env, StartExecutionCallback{}).IsEmpty()) {
diff --git a/test/parallel/test-inspect-address-in-use.js b/test/parallel/test-inspect-address-in-use.js
new file mode 100644
index 00000000000000..a5b2d98537dfe4
--- /dev/null
+++ b/test/parallel/test-inspect-address-in-use.js
@@ -0,0 +1,59 @@
+'use strict';
+const common = require('../common');
+common.skipIfInspectorDisabled();
+
+const { spawnSync } = require('child_process');
+const { createServer } = require('http');
+const assert = require('assert');
+const fixtures = require('../common/fixtures');
+const entry = fixtures.path('empty.js');
+const { Worker } = require('worker_threads');
+
+function testOnServerListen(fn) {
+  const server = createServer((socket) => {
+    socket.end('echo');
+  });
+
+  server.on('listening', () => {
+    fn(server);
+    server.close();
+  });
+  server.listen(0, '127.0.0.1');
+}
+
+function testChildProcess(getArgs, exitCode) {
+  testOnServerListen((server) => {
+    const { port } = server.address();
+    const child = spawnSync(process.execPath, getArgs(port));
+    const stderr = child.stderr.toString().trim();
+    const stdout = child.stdout.toString().trim();
+    console.log('[STDERR]');
+    console.log(stderr);
+    console.log('[STDOUT]');
+    console.log(stdout);
+    const match = stderr.match(
+      /Starting inspector on 127\.0\.0\.1:(\d+) failed: address already in use/
+    );
+    assert.notStrictEqual(match, null);
+    assert.strictEqual(match[1], port + '');
+    assert.strictEqual(child.status, exitCode);
+  });
+}
+
+testChildProcess(
+  (port) => [`--inspect=${port}`, '--build-snapshot', entry], 0);
+testChildProcess(
+  (port) => [`--inspect=${port}`, entry], 0);
+
+testOnServerListen((server) => {
+  const { port } = server.address();
+  const worker = new Worker(entry, {
+    execArgv: [`--inspect=${port}`]
+  });
+
+  worker.on('error', common.mustNotCall());
+
+  worker.on('exit', common.mustCall((code) => {
+    assert.strictEqual(code, 0);
+  }));
+});