Fix provider null return value

flare_flutter/lib/cache.dart

@@ -1,5 +1,7 @@
 import 'dart:async';
 
+import 'package:pedantic/pedantic.dart';
+
 import 'asset_provider.dart';
 import 'cache_asset.dart';
 
@@ -55,7 +57,7 @@ abstract class Cache<T extends CacheAsset> {
     assert(asset != null);
 
     _assets[assetProvider] = asset;
-    asset.load(this, assetProvider);
+    unawaited(asset.load(this, assetProvider));
     return asset.isAvailable ? asset : await asset.onLoaded() as T;
   }
 

flare_flutter/lib/cache_asset.dart

@@ -34,7 +34,8 @@ abstract class CacheAsset {
     return completer.future;
   }
 
-  void load(Cache cache, AssetProvider assetProvider) => _cache = cache;
+  Future<void> load(Cache cache, AssetProvider assetProvider) async =>
+      _cache = cache;
 
   void completeLoad() {
     if (_callbacks != null) {

flare_flutter/lib/flare_cache_asset.dart

@@ -1,4 +1,3 @@
-import 'dart:typed_data';
 import 'package:flutter/foundation.dart';
 
 import 'asset_provider.dart';
@@ -25,17 +24,19 @@ class FlareCacheAsset extends CacheAsset {
   }
 
   @override
-  void load(Cache cache, AssetProvider assetProvider) {
-    super.load(cache, assetProvider);
-    assetProvider.load().then((ByteData data) {
-      if (useCompute) {
-        compute(FlutterActor.loadFromByteData, data)
-            .then((FlutterActor actor) => loadedActor(actor, assetProvider));
-      } else {
-        FlutterActor.loadFromByteData(data)
-            .then((FlutterActor actor) => loadedActor(actor, assetProvider));
-      }
-    });
+  Future<void> load(Cache cache, AssetProvider assetProvider) async {
+    await super.load(cache, assetProvider);
+
+    final data = await assetProvider.load();
+    if (data == null) {
+      print("Failed to load flare file from $assetProvider.");
+      return;
+    }
+
+    final actor = useCompute
+        ? await compute(FlutterActor.loadFromByteData, data)
+        : await FlutterActor.loadFromByteData(data);
+    loadedActor(actor, assetProvider);
   }
 
   @override

flare_flutter/pubspec.yaml

@@ -11,6 +11,7 @@ dependencies:
   flare_dart:
     path: ../flare_dart/
   meta: ^1.0.5
+  pedantic: ^1.9.0
 dev_dependencies:
   flutter_test:
     sdk: flutter