diff --git a/scripts/e2e/cron-mcp-cleanup-docker-client.ts b/scripts/e2e/cron-mcp-cleanup-docker-client.ts
index 9d0599d9db0c..08cdc5441ddc 100644
--- a/scripts/e2e/cron-mcp-cleanup-docker-client.ts
+++ b/scripts/e2e/cron-mcp-cleanup-docker-client.ts
@@ -35,11 +35,18 @@ export function assertCronFinishedOk(finished: CronFinishedPayload | undefined):
   }
 }
 
+function parseProbePid(raw: string): number | undefined {
+  const text = raw.trim();
+  if (!/^[1-9]\d*$/u.test(text)) {
+    return undefined;
+  }
+  const pid = Number(text);
+  return Number.isSafeInteger(pid) ? pid : undefined;
+}
+
 async function readProbePid(pidPath: string): Promise<number | undefined> {
   try {
-    const raw = (await fs.readFile(pidPath, "utf-8")).trim();
-    const pid = Number.parseInt(raw, 10);
-    return Number.isInteger(pid) && pid > 0 ? pid : undefined;
+    return parseProbePid(await fs.readFile(pidPath, "utf-8"));
   } catch {
     return undefined;
   }
@@ -51,8 +58,8 @@ async function readProbePids(pidsPath: string): Promise<number[]> {
     const pids: number[] = [];
     const seen = new Set<number>();
     for (const line of raw.split(/\r?\n/)) {
-      const pid = Number.parseInt(line.trim(), 10);
-      if (!Number.isInteger(pid) || pid <= 0 || seen.has(pid)) {
+      const pid = parseProbePid(line);
+      if (pid === undefined || seen.has(pid)) {
         continue;
       }
       seen.add(pid);
diff --git a/test/scripts/cron-mcp-cleanup-docker-client.test.ts b/test/scripts/cron-mcp-cleanup-docker-client.test.ts
index 113ea820a221..3cbfde817aca 100644
--- a/test/scripts/cron-mcp-cleanup-docker-client.test.ts
+++ b/test/scripts/cron-mcp-cleanup-docker-client.test.ts
@@ -37,6 +37,20 @@ describe("cron MCP cleanup docker client", () => {
     }
   });
 
+  it("does not parse malformed probe pid prefixes", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "openclaw-cron-mcp-client-"));
+    try {
+      const pidPath = path.join(root, "probe.pid");
+      fs.writeFileSync(pidPath, "123abc\n", "utf8");
+
+      const startedAt = Date.now();
+      await expect(waitForProbePid(pidPath, { pollMs: 1, timeoutMs: 20 })).resolves.toBeUndefined();
+      expect(Date.now() - startedAt).toBeLessThan(1000);
+    } finally {
+      fs.rmSync(root, { force: true, recursive: true });
+    }
+  });
+
   it("accepts cron finished events only when the run status is ok", () => {
     expect(() => assertCronFinishedOk({ status: "ok" })).not.toThrow();
     expect(() => assertCronFinishedOk({ status: "error" })).toThrow(