diff --git a/lib/ts/package.json b/lib/ts/package.json
index 6ae2d3d..55bbd13 100644
--- a/lib/ts/package.json
+++ b/lib/ts/package.json
@@ -15,7 +15,7 @@
   },
   "scripts": {
     "build": "tsc",
-    "test": "vitest run --teardown-timeout=20000 --test-timeout=20000"
+    "test": "vitest run --teardown-timeout=20000 --test-timeout=20000 --sequence.concurrent"
   },
   "dependencies": {
     "@types/node": "^22.10.5"
diff --git a/lib/ts/src/lib.test.ts b/lib/ts/src/lib.test.ts
index 4e4bae1..47ebca0 100644
--- a/lib/ts/src/lib.test.ts
+++ b/lib/ts/src/lib.test.ts
@@ -6,3 +6,9 @@ test('test connection timeout', async ({expect}) => {
     await parentIpc.start();
     await expect(parentIpc.wait()).rejects.toThrowError('timed out');
 });
+
+test('test process stop before connection accept', async ({expect}) => {
+    const parentIpc = new ParentIPC('testdata/sleep3.sh', []);
+    await parentIpc.start();
+    await expect(parentIpc.wait()).rejects.toThrowError('command exited before connection established');
+});
diff --git a/lib/ts/src/lib.ts b/lib/ts/src/lib.ts
index 6bc4157..0b01179 100644
--- a/lib/ts/src/lib.ts
+++ b/lib/ts/src/lib.ts
@@ -45,6 +45,7 @@ abstract class IPCCommon {
     protected pendingCalls: Record<number, (result: CallResult) => void> = {};
     protected stopRequested: boolean = false;
     protected processingCalls: number = 0;
+    protected ready = false;
 
     protected errorQueue = new AsyncQueue<Error>();
     protected onClose?: () => void;
@@ -84,6 +85,8 @@ abstract class IPCCommon {
                 this.raiseErr(new Error(`${ e }`));
             }
         });
+
+        this.ready = true;
     }
 
     protected processMsg(msg: Message): void {
@@ -266,11 +269,16 @@ export class ParentIPC extends IPCCommon {
 
     async wait(): Promise<void> {
         return new Promise(async (resolve, reject) => {
-            if (!this.cmd) throw new Error('Command is not started yet');
+            if (!this.cmd) {
+                reject('Command is not started yet');
+                return;
+            }
             this.cmd.addListener('close', (code, signal) => {
                 if (signal || code) {
                     if (signal) reject(new Error(`Process exited with signal ${ signal }`));
                     else reject(new Error(`Process exited with code ${ code }`));
+                } else if(!this.ready) {
+                    reject('command exited before connection established');
                 } else {
                     resolve();
                 }
diff --git a/lib/ts/testdata/sleep15.sh b/lib/ts/testdata/sleep15.sh
index 8f5eec9..76f2852 100755
--- a/lib/ts/testdata/sleep15.sh
+++ b/lib/ts/testdata/sleep15.sh
@@ -1,5 +1,3 @@
 #!/usr/bin/env bash
 
-echo sleeping...
 sleep 15s
-echo slept
diff --git a/lib/ts/testdata/sleep3.sh b/lib/ts/testdata/sleep3.sh
new file mode 100755
index 0000000..426a98a
--- /dev/null
+++ b/lib/ts/testdata/sleep3.sh
@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+sleep 3s