diff --git a/packages/powersync-sdk-common/src/client/sync/stream/AbstractStreamingSyncImplementation.ts b/packages/powersync-sdk-common/src/client/sync/stream/AbstractStreamingSyncImplementation.ts
index 6dc1d9c8..49623659 100644
--- a/packages/powersync-sdk-common/src/client/sync/stream/AbstractStreamingSyncImplementation.ts
+++ b/packages/powersync-sdk-common/src/client/sync/stream/AbstractStreamingSyncImplementation.ts
@@ -64,7 +64,7 @@ export abstract class AbstractStreamingSyncImplementation extends BaseObserver<S
   }
 
   get lastSyncedAt() {
-    return new Date(this._lastSyncedAt);
+    return this._lastSyncedAt && new Date(this._lastSyncedAt);
   }
 
   protected get logger() {