diff --git a/.changeset/cuddly-news-carry.md b/.changeset/cuddly-news-carry.md
new file mode 100644
index 000000000..3910db1fe
--- /dev/null
+++ b/.changeset/cuddly-news-carry.md
@@ -0,0 +1,5 @@
+---
+'@powersync/diagnostics-app': patch
+---
+
+Fix handling of partial checkpoints
diff --git a/tools/diagnostics-app/src/library/powersync/RecordingStorageAdapter.ts b/tools/diagnostics-app/src/library/powersync/RecordingStorageAdapter.ts
index 2fcd28622..ca2dd904d 100644
--- a/tools/diagnostics-app/src/library/powersync/RecordingStorageAdapter.ts
+++ b/tools/diagnostics-app/src/library/powersync/RecordingStorageAdapter.ts
@@ -41,8 +41,9 @@ export class RecordingStorageAdapter extends SqliteBucketStorage {
     });
   }
 
-  async syncLocalDatabase(checkpoint: Checkpoint) {
-    const r = await super.syncLocalDatabase(checkpoint);
+  async syncLocalDatabase(checkpoint: Checkpoint, priority?: number) {
+    const r = await super.syncLocalDatabase(checkpoint, priority);
+
     // Refresh schema asynchronously, to allow us to better measure
     // performance of initial sync.
     setTimeout(() => {