diff --git a/workmanager_android/CHANGELOG.md b/workmanager_android/CHANGELOG.md
index ebd96f7e..9654ccf5 100644
--- a/workmanager_android/CHANGELOG.md
+++ b/workmanager_android/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.9.1
+
+- **FIX**: NullPointerException on io.flutter.embedding.engine.loader.FlutterApplicationInfo.flutterAssetsDir, when App and WorkManager task triggers at the same time
+
 ## 0.9.0+2
 
  - **FIX**: Android initialization bug and iOS 14 availability annotations (#647).
diff --git a/workmanager_android/android/src/main/kotlin/dev/fluttercommunity/workmanager/BackgroundWorker.kt b/workmanager_android/android/src/main/kotlin/dev/fluttercommunity/workmanager/BackgroundWorker.kt
index 367b3bd7..278f735e 100644
--- a/workmanager_android/android/src/main/kotlin/dev/fluttercommunity/workmanager/BackgroundWorker.kt
+++ b/workmanager_android/android/src/main/kotlin/dev/fluttercommunity/workmanager/BackgroundWorker.kt
@@ -9,6 +9,7 @@ import androidx.work.WorkerParameters
 import com.google.common.util.concurrent.ListenableFuture
 import dev.fluttercommunity.workmanager.pigeon.TaskStatus
 import dev.fluttercommunity.workmanager.pigeon.WorkmanagerFlutterApi
+import io.flutter.FlutterInjector
 import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.embedding.engine.dart.DartExecutor
 import io.flutter.embedding.engine.loader.FlutterLoader
@@ -29,8 +30,6 @@ class BackgroundWorker(
     companion object {
         const val PAYLOAD_KEY = "dev.fluttercommunity.workmanager.INPUT_DATA"
         const val DART_TASK_KEY = "dev.fluttercommunity.workmanager.DART_TASK"
-
-        private val flutterLoader = FlutterLoader()
     }
 
     private val payload
@@ -65,7 +64,7 @@ class BackgroundWorker(
     override fun startWork(): ListenableFuture<Result> {
         startTime = System.currentTimeMillis()
 
-        engine = FlutterEngine(applicationContext)
+        val flutterLoader: FlutterLoader = FlutterInjector.instance().flutterLoader()
 
         if (!flutterLoader.initialized()) {
             flutterLoader.startInitialization(applicationContext)
@@ -76,6 +75,7 @@ class BackgroundWorker(
             null,
             Handler(Looper.getMainLooper()),
         ) {
+            engine = FlutterEngine(applicationContext)
             val callbackHandle = SharedPreferenceHelper.getCallbackHandle(applicationContext)
             val callbackInfo = FlutterCallbackInformation.lookupCallbackInformation(callbackHandle)
 
diff --git a/workmanager_android/pubspec.yaml b/workmanager_android/pubspec.yaml
index 32e4b523..ae6dc1c5 100644
--- a/workmanager_android/pubspec.yaml
+++ b/workmanager_android/pubspec.yaml
@@ -1,6 +1,6 @@
 name: workmanager_android
 description: Android implementation of the workmanager plugin.
-version: 0.9.0+2
+version: 0.9.1
 # publish_to: none
 homepage: https://github.com/fluttercommunity/flutter_workmanager
 repository: https://github.com/fluttercommunity/flutter_workmanager