diff --git a/crates/index-scheduler/src/queue/tasks.rs b/crates/index-scheduler/src/queue/tasks.rs
index bb6930b4b..c88192e17 100644
--- a/crates/index-scheduler/src/queue/tasks.rs
+++ b/crates/index-scheduler/src/queue/tasks.rs
@@ -94,6 +94,10 @@ impl TaskQueue {
         debug_assert!(old_task != *task);
         debug_assert_eq!(old_task.uid, task.uid);
         debug_assert!(old_task.batch_uid.is_none() && task.batch_uid.is_some());
+        debug_assert!(
+            old_task.batch_uid.is_none() && task.batch_uid.is_some(),
+            "\n==> old: {old_task:?}\n==> new: {task:?}"
+        );
 
         if old_task.status != task.status {
             self.update_status(wtxn, old_task.status, |bitmap| {
diff --git a/crates/index-scheduler/src/scheduler/process_index_operation.rs b/crates/index-scheduler/src/scheduler/process_index_operation.rs
index 365f7acd4..eff3740a0 100644
--- a/crates/index-scheduler/src/scheduler/process_index_operation.rs
+++ b/crates/index-scheduler/src/scheduler/process_index_operation.rs
@@ -78,9 +78,7 @@ impl IndexScheduler {
                     if let DocumentOperation::Add(content_uuid) = operation {
                         let content_file = self.queue.file_store.get_update(*content_uuid)?;
                         let mmap = unsafe { memmap2::Mmap::map(&content_file)? };
-                        if !mmap.is_empty() {
-                            content_files.push(mmap);
-                        }
+                        content_files.push(mmap);
                     }
                 }
 
diff --git a/crates/meilisearch/tests/documents/add_documents.rs b/crates/meilisearch/tests/documents/add_documents.rs
index d164d9a27..6c9222717 100644
--- a/crates/meilisearch/tests/documents/add_documents.rs
+++ b/crates/meilisearch/tests/documents/add_documents.rs
@@ -1225,7 +1225,25 @@ async fn add_no_documents() {
     snapshot!(code, @"202 Accepted");
     let task = server.wait_task(task.uid()).await;
     let task = task.succeeded();
-    snapshot!(task, @"");
+    snapshot!(task, @r#"
+    {
+      "uid": "[uid]",
+      "batchUid": "[batch_uid]",
+      "indexUid": "kefir",
+      "status": "succeeded",
+      "type": "documentAdditionOrUpdate",
+      "canceledBy": null,
+      "details": {
+        "receivedDocuments": 0,
+        "indexedDocuments": 0
+      },
+      "error": null,
+      "duration": "[duration]",
+      "enqueuedAt": "[date]",
+      "startedAt": "[date]",
+      "finishedAt": "[date]"
+    }
+    "#);
 }
 
 #[actix_rt::test]