diff --git a/src/applications/differential/engine/DifferentialRevisionTimelineEngine.php b/src/applications/differential/engine/DifferentialRevisionTimelineEngine.php
--- a/src/applications/differential/engine/DifferentialRevisionTimelineEngine.php
+++ b/src/applications/differential/engine/DifferentialRevisionTimelineEngine.php
@@ -57,15 +57,17 @@
     // side effect, which means it will ultimately adjust the transaction
     // comments and affect timeline rendering.
 
-    $old = array_select_keys($changesets, $old_ids);
-    $new = array_select_keys($changesets, $new_ids);
-    id(new PhabricatorInlineCommentAdjustmentEngine())
-      ->setViewer($viewer)
-      ->setRevision($revision)
-      ->setOldChangesets($old)
-      ->setNewChangesets($new)
-      ->setInlines($inlines)
-      ->execute();
+    if (!empty($new)) {
+      $old = array_select_keys($changesets, $old_ids);
+      $new = array_select_keys($changesets, $new_ids);
+      id(new PhabricatorInlineCommentAdjustmentEngine())
+        ->setViewer($viewer)
+        ->setRevision($revision)
+        ->setOldChangesets($old)
+        ->setNewChangesets($new)
+        ->setInlines($inlines)
+        ->execute();
+    }
 
     return id(new DifferentialTransactionView())
       ->setViewData($view_data)