diff --git a/src/applications/differential/storage/DifferentialViewState.php b/src/applications/differential/storage/DifferentialViewState.php
--- a/src/applications/differential/storage/DifferentialViewState.php
+++ b/src/applications/differential/storage/DifferentialViewState.php
@@ -49,6 +49,11 @@
       $properties['diffID'] = (int)$diff_id;
     }
 
+    $changeset_id = $changeset->getID();
+    if ($changeset_id !== null) {
+      $properties['changesetID'] = (int)$changeset_id;
+    }
+
     $path_hash = $this->getChangesetPathHash($changeset);
     $changeset_phid = $this->getChangesetKey($changeset);
 
diff --git a/src/infrastructure/diff/viewstate/PhabricatorChangesetViewStateEngine.php b/src/infrastructure/diff/viewstate/PhabricatorChangesetViewStateEngine.php
--- a/src/infrastructure/diff/viewstate/PhabricatorChangesetViewStateEngine.php
+++ b/src/infrastructure/diff/viewstate/PhabricatorChangesetViewStateEngine.php
@@ -197,12 +197,12 @@
     $entries = isort($entries, 'epoch');
 
     if ($entries) {
-      $other_key = last_key($entries);
       $other_spec = last($entries);
 
       $this_version = (int)$changeset->getDiffID();
       $other_version = (int)idx($other_spec, 'diffID');
       $other_value = (bool)idx($other_spec, 'value', false);
+      $other_id = (int)idx($other_spec, 'changesetID');
 
       if ($other_value === false) {
         $is_hidden = false;
@@ -211,10 +211,14 @@
       } else {
         $viewer = $this->getViewer();
 
-        $other_changeset = id(new DifferentialChangesetQuery())
-          ->setViewer($viewer)
-          ->withIDs(array($other_key))
-          ->executeOne();
+        if ($other_id) {
+          $other_changeset = id(new DifferentialChangesetQuery())
+            ->setViewer($viewer)
+            ->withIDs(array($other_id))
+            ->executeOne();
+        } else {
+          $other_changeset = null;
+        }
 
         $is_modified = false;
         if ($other_changeset) {