diff --git a/package.json b/package.json
index d278793451e99..3390616c1b97e 100644
--- a/package.json
+++ b/package.json
@@ -141,4 +141,4 @@
       "node script/gen-hunspell-filenames.js"
     ]
   }
-}
\ No newline at end of file
+}
diff --git a/spec-main/api-app-spec.ts b/spec-main/api-app-spec.ts
index 42dcc7c037709..b67bac74ad002 100644
--- a/spec-main/api-app-spec.ts
+++ b/spec-main/api-app-spec.ts
@@ -218,6 +218,7 @@ describe('app module', () => {
       await emittedOnce(first.stdout, 'data');
       // Start second app when received output.
       const second = cp.spawn(process.execPath, [appPath]);
+
       const [code2] = await emittedOnce(second, 'exit');
       expect(code2).to.equal(1);
       const [code1] = await emittedOnce(first, 'exit');
@@ -238,9 +239,11 @@ describe('app module', () => {
       const secondInstanceArgs = [process.execPath, appPath, ...testArgs.args, '--some-switch', 'some-arg'];
       const second = cp.spawn(secondInstanceArgs[0], secondInstanceArgs.slice(1));
       const secondStdoutLines = second.stdout.pipe(split());
-      const dataAckPromise = emittedOnce(secondStdoutLines, 'data');
+      let ackData;
+      while ((ackData = await emittedOnce(secondStdoutLines, 'data'))[0].toString().length === 0) {
+        // This isn't valid data.
+      }
 
-      const ackData = await dataAckPromise;
       const [code2] = await emittedOnce(second, 'exit');
       expect(code2).to.equal(1);
       const [code1] = await emittedOnce(first, 'exit');
@@ -312,14 +315,6 @@ describe('app module', () => {
       });
     });
 
-    it('gets back an empty ack by default', async () => {
-      await testArgumentPassing({
-        args: ['--send-ack'],
-        expectedAdditionalData: null,
-        expectedAck: null
-      });
-    });
-
     it('sends and receives data', async () => {
       await testArgumentPassing({
         args: ['--send-ack', '--prevent-default', '--send-data'],
diff --git a/spec/fixtures/api/singleton-data/main.js b/spec/fixtures/api/singleton-data/main.js
index a84fddb40616f..e1ba175f3669a 100644
--- a/spec/fixtures/api/singleton-data/main.js
+++ b/spec/fixtures/api/singleton-data/main.js
@@ -44,7 +44,9 @@ app.on('second-instance', (event, args, workingDirectory, data, ackCallback) =>
   setImmediate(() => {
     console.log([JSON.stringify(args), JSON.stringify(data)].join('||'));
     sendAck ? ackCallback(ackObj) : ackCallback();
-    app.exit(0);
+    setImmediate(() => {
+      app.exit(0);
+    });
   });
 });