diff --git a/CHANGELOG.md b/CHANGELOG.md
index 234d26150c..808fd81e6f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,14 @@
 
 ---
 
+## [3.8.24] — TBD
+
+### 🐛 Fixed
+
+- fix(cli): `ServerSupervisor.handleExit` now coerces the exit code to a number before calling `process.exit()` — Node.js v24 throws `TypeError [ERR_INVALID_ARG_TYPE]` when `process.exit()` receives a string (e.g. `'ENOENT'` from a spawn `error` event's `err.code`). The `error` callback also now passes `-1` instead of the raw `err.code`, which is an OS error string rather than a meaningful exit code. ([#3748](https://github.com/diegosouzapw/OmniRoute/issues/3748))
+
+---
+
 ## [3.8.23] — TBD
 
 ### ✨ New Features
diff --git a/bin/cli/runtime/processSupervisor.mjs b/bin/cli/runtime/processSupervisor.mjs
index 135514cfbd..b16de9670e 100644
--- a/bin/cli/runtime/processSupervisor.mjs
+++ b/bin/cli/runtime/processSupervisor.mjs
@@ -42,17 +42,20 @@ export class ServerSupervisor {
       });
     }
 
-    this.child.on("error", (err) => this.handleExit(err.code ?? -1, err));
+    this.child.on("error", (err) => this.handleExit(-1, err));
     this.child.on("exit", (code) => this.handleExit(code));
 
     return this.child;
   }
 
   handleExit(code) {
+    // Node.js v24+ requires process.exit() to receive a number. Spawn-error events
+    // deliver err.code (a string like 'ENOENT') via the 'error' listener; normalise here.
+    const exitCode = typeof code === "number" ? code : null;
     cleanupPidFile("server");
 
-    if (this.isShuttingDown || code === 0) {
-      process.exit(code || 0);
+    if (this.isShuttingDown || exitCode === 0) {
+      process.exit(exitCode ?? 0);
       return;
     }
 
@@ -71,7 +74,7 @@ export class ServerSupervisor {
         }
       }
       this.dumpCrashLog();
-      process.exit(code ?? 1);
+      process.exit(exitCode ?? 1);
       return;
     }
 
diff --git a/tests/unit/cli-process-supervisor.test.ts b/tests/unit/cli-process-supervisor.test.ts
index 8185d874a3..99012ad82e 100644
--- a/tests/unit/cli-process-supervisor.test.ts
+++ b/tests/unit/cli-process-supervisor.test.ts
@@ -195,6 +195,36 @@ test("ServerSupervisor reseta restartCount após processo viver >=30s", async ()
   assert.equal(supervisor.restartCount, 1); // reset p/ 0, depois incrementado p/ 1
 });
 
+// --- Node.js v24 compat: process.exit() must receive a number (#3748) ---
+
+test("ServerSupervisor.handleExit com string code não passa string para process.exit (#3748)", async () => {
+  const { ServerSupervisor } = await import("../../bin/cli/runtime/processSupervisor.mjs");
+
+  const exits: Array<number | string | undefined> = [];
+  const origExit = process.exit.bind(process);
+  // @ts-ignore
+  process.exit = (code?: number | string) => exits.push(code);
+
+  const supervisor = new ServerSupervisor({
+    serverPath: "/fake/server.js",
+    env: {},
+    maxRestarts: 0,
+  });
+  // Simulates the 'error' event on child spawn failure: err.code = 'ENOENT' (string, not number).
+  // maxRestarts=0 → restartCount(0) >= maxRestarts(0) → process.exit() is called immediately.
+  supervisor.startedAt = Date.now() - 100;
+  supervisor.handleExit("ENOENT" as any);
+
+  // @ts-ignore
+  process.exit = origExit;
+  assert.equal(exits.length, 1, "process.exit deve ser chamado exatamente 1 vez");
+  assert.equal(
+    typeof exits[0],
+    "number",
+    `process.exit deve receber number, recebeu: ${typeof exits[0]} (${exits[0]})`
+  );
+});
+
 // --- pid.mjs multi-service ---
 
 test("writePidFile/readPidFile/cleanupPidFile operam por service", async () => {