diff --git a/src/applications/dashboard/paneltype/PhabricatorDashboardQueryPanelType.php b/src/applications/dashboard/paneltype/PhabricatorDashboardQueryPanelType.php
--- a/src/applications/dashboard/paneltype/PhabricatorDashboardQueryPanelType.php
+++ b/src/applications/dashboard/paneltype/PhabricatorDashboardQueryPanelType.php
@@ -76,6 +76,13 @@
         ->executeOne();
     }
 
+    if (!$viewer->isLoggedIn() && !$saved) {
+    // If user is not logged in, authored/assigned/etc queries are empty.
+      return id(new PHUIObjectItemListView())
+        ->setUser($viewer)
+        ->setNoDataString(pht('You must log in to see this data.'));
+    }
+
     if (!$saved) {
       throw new Exception(
         pht(