Handle null Darwin getTitleAsync results without crashing

CHANGELOG.md

@@ -12,6 +12,7 @@ To know more about breaking changes, see the [Migration Guide][].
 
 - Fix Android 14+ permission requests incorrectly short-circuiting when only part of the requested media access was already granted.
 - Fix Darwin video durations being truncated instead of rounded, so `AssetEntity.duration` matches the system album display more closely.
+- Fix Darwin `getTitleAsync` returning a null channel result by falling back to an empty string.
 
 ## 3.9.0
 

lib/src/internal/plugin.dart

@@ -551,15 +551,16 @@ class PhotoManagerPlugin with BasePlugin, IosPlugin, AndroidPlugin, OhosPlugin {
     PMDarwinAVFileType? darwinFileType,
   }) async {
     if (Platform.isIOS || Platform.isMacOS) {
-      return await _channel.invokeMethod(
-        PMConstants.mGetTitleAsync,
-        <String, dynamic>{
-          'id': entity.id,
-          'subtype': subtype,
-          'isOrigin': isOrigin,
-          'darwinFileType': darwinFileType?.value ?? 0,
-        },
-      );
+      return await _channel.invokeMethod<String>(
+            PMConstants.mGetTitleAsync,
+            <String, dynamic>{
+              'id': entity.id,
+              'subtype': subtype,
+              'isOrigin': isOrigin,
+              'darwinFileType': darwinFileType?.value ?? 0,
+            },
+          ) ??
+          '';
     }
     return entity.title ?? '';
   }