diff --git a/.changeset/lucky-eyes-double.md b/.changeset/lucky-eyes-double.md
new file mode 100644
index 00000000000..f4cd725d7a9
--- /dev/null
+++ b/.changeset/lucky-eyes-double.md
@@ -0,0 +1,6 @@
+---
+"@pnpm/default-reporter": patch
+"pnpm": patch
+---
+
+The reporter should not crash when the CLI process is kill during lifecycle scripts execution [#5588](https://github.com/pnpm/pnpm/pull/5588).
diff --git a/.changeset/moody-weeks-reply.md b/.changeset/moody-weeks-reply.md
new file mode 100644
index 00000000000..aa14012811c
--- /dev/null
+++ b/.changeset/moody-weeks-reply.md
@@ -0,0 +1,5 @@
+---
+"@pnpm/lifecycle": patch
+---
+
+Never log a lifecycle exit debug log without an exit code [#5588](https://github.com/pnpm/pnpm/pull/5588).
diff --git a/packages/default-reporter/src/reporterForClient/reportLifecycleScripts.ts b/packages/default-reporter/src/reporterForClient/reportLifecycleScripts.ts
index f7722e6d882..60396a39d04 100644
--- a/packages/default-reporter/src/reporterForClient/reportLifecycleScripts.ts
+++ b/packages/default-reporter/src/reporterForClient/reportLifecycleScripts.ts
@@ -266,6 +266,7 @@ function formatLine (maxWidth: number, logObj: LifecycleLog) {
 }
 
 function cutLine (line: string, maxLength: number) {
+  if (!line) return '' // This actually should never happen but it is better to be safe
   return stripAnsi(line).slice(0, maxLength)
 }
 
diff --git a/packages/default-reporter/test/reportingLifecycleScripts.ts b/packages/default-reporter/test/reportingLifecycleScripts.ts
index dbb9522a74d..92c9bc7ad8d 100644
--- a/packages/default-reporter/test/reportingLifecycleScripts.ts
+++ b/packages/default-reporter/test/reportingLifecycleScripts.ts
@@ -739,6 +739,52 @@ ${STATUS_INDENTATION} ${STATUS_FAILED}`)
   })
 })
 
+test('do not fail if the debug log has no output', (done) => {
+  const output$ = toOutput$({
+    context: { argv: ['install'] },
+    reportingOptions: { outputMaxWidth: 79 },
+    streamParser: createStreamParser(),
+  })
+
+  const wd = path.resolve(process.cwd(), 'node_modules', '.registry.npmjs.org', 'foo', '1.0.0', 'node_modules', 'foo')
+
+  lifecycleLogger.debug({
+    depPath: 'registry.npmjs.org/foo/1.0.0',
+    optional: false,
+    script: 'node foo',
+    stage: 'install',
+    wd,
+  })
+  lifecycleLogger.debug({
+    depPath: 'registry.npmjs.org/foo/1.0.0',
+    line: undefined as any, // eslint-disable-line @typescript-eslint/no-explicit-any
+    stage: 'install',
+    stdio: 'stdout',
+    wd,
+  })
+  lifecycleLogger.debug({
+    depPath: 'registry.npmjs.org/foo/1.0.0',
+    exitCode: 1,
+    optional: false,
+    stage: 'install',
+    wd,
+  })
+
+  expect.assertions(1)
+
+  output$.pipe(skip(1), take(1), map(normalizeNewline)).subscribe({
+    complete: () => done(),
+    error: done,
+    next: (output: string) => {
+      expect(replaceTimeWith1Sec(output)).toBe(`\
+${chalk.gray('node_modules/.registry.npmjs.org/foo/1.0.0/node_modules/')}foo: Running install script, failed in 1s
+.../foo/1.0.0/node_modules/foo ${INSTALL}$ node foo
+${OUTPUT_INDENTATION} 
+${STATUS_INDENTATION} ${STATUS_FAILED}`)
+    },
+  })
+})
+
 // Many libs use stderr for logging, so showing all stderr adds not much value
 test['skip']('prints lifecycle progress', (done) => {
   const output$ = toOutput$({
diff --git a/packages/lifecycle/src/runLifecycleHook.ts b/packages/lifecycle/src/runLifecycleHook.ts
index f44cfd64900..cde86cee426 100644
--- a/packages/lifecycle/src/runLifecycleHook.ts
+++ b/packages/lifecycle/src/runLifecycleHook.ts
@@ -100,7 +100,7 @@ export async function runLifecycleHook (
         // Preventing the pnpm reporter from overriding the project's script output
         return
       }
-      const code = arguments[3]
+      const code = arguments[3] ?? 1
       lifecycleLogger.debug({
         depPath: opts.depPath,
         exitCode: code,