diff --git a/mobile/.gitignore b/mobile/.gitignore
index f643592c0..93d67bfee 100644
--- a/mobile/.gitignore
+++ b/mobile/.gitignore
@@ -53,4 +53,6 @@ ios/fastlane/report.xml
 # Isar
 default.isar
 default.isar.lock
-libisar.so
\ No newline at end of file
+libisar.so
+default.isar-lck 
+isar.dll
\ No newline at end of file
diff --git a/mobile/lib/shared/models/asset.dart b/mobile/lib/shared/models/asset.dart
index ac5f6b2e9..4cfcea014 100644
--- a/mobile/lib/shared/models/asset.dart
+++ b/mobile/lib/shared/models/asset.dart
@@ -228,7 +228,6 @@ class Asset {
   bool canUpdate(Asset a) {
     assert(isInDb);
     assert(checksum == a.checksum);
-    assert(thumbhash == a.thumbhash);
     assert(a.storage != AssetState.merged);
     return a.updatedAt.isAfter(updatedAt) ||
         a.isRemote && !isRemote ||
@@ -268,6 +267,7 @@ class Asset {
           livePhotoVideoId: livePhotoVideoId,
           isFavorite: isFavorite,
           isArchived: isArchived,
+          thumbhash: thumbhash,
         );
       }
     } else {
@@ -282,6 +282,7 @@ class Asset {
           // isFavorite + isArchived are not set by device-only assets
           isFavorite: a.isFavorite,
           isArchived: a.isArchived,
+          thumbhash: a.thumbhash,
           exifInfo: a.exifInfo?.copyWith(id: id) ?? exifInfo,
         );
       } else {
diff --git a/mobile/lib/utils/migration.dart b/mobile/lib/utils/migration.dart
index 724f3a872..2356c7314 100644
--- a/mobile/lib/utils/migration.dart
+++ b/mobile/lib/utils/migration.dart
@@ -11,6 +11,8 @@ Future<void> migrateDatabaseIfNeeded(Isar db) async {
       await _migrateTo(db, 2);
     case 2:
       await _migrateTo(db, 3);
+    case 3:
+      await _migrateTo(db, 4);
   }
 }