diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -4415,6 +4415,7 @@
     'PhabricatorProjectDAO' => 'applications/project/storage/PhabricatorProjectDAO.php',
     'PhabricatorProjectDatasource' => 'applications/project/typeahead/PhabricatorProjectDatasource.php',
     'PhabricatorProjectDescriptionField' => 'applications/project/customfield/PhabricatorProjectDescriptionField.php',
+    'PhabricatorProjectDescriptionTransaction' => 'applications/project/xaction/PhabricatorProjectDescriptionTransaction.php',
     'PhabricatorProjectDetailsProfileMenuItem' => 'applications/project/menuitem/PhabricatorProjectDetailsProfileMenuItem.php',
     'PhabricatorProjectDropEffect' => 'applications/project/icon/PhabricatorProjectDropEffect.php',
     'PhabricatorProjectEditController' => 'applications/project/controller/PhabricatorProjectEditController.php',
@@ -11056,6 +11057,7 @@
     'PhabricatorProjectDAO' => 'PhabricatorLiskDAO',
     'PhabricatorProjectDatasource' => 'PhabricatorTypeaheadDatasource',
     'PhabricatorProjectDescriptionField' => 'PhabricatorProjectStandardCustomField',
+    'PhabricatorProjectDescriptionTransaction' => 'PhabricatorProjectTypeTransaction',
     'PhabricatorProjectDetailsProfileMenuItem' => 'PhabricatorProfileMenuItem',
     'PhabricatorProjectDropEffect' => 'Phobject',
     'PhabricatorProjectEditController' => 'PhabricatorProjectController',
diff --git a/src/applications/diffusion/controller/DiffusionBlameController.php b/src/applications/diffusion/controller/DiffusionBlameController.php
--- a/src/applications/diffusion/controller/DiffusionBlameController.php
+++ b/src/applications/diffusion/controller/DiffusionBlameController.php
@@ -198,6 +198,10 @@
       $map[$identifier] = $data;
     }
 
+    if (empty($epochs)) {
+      $epochs[] = 0;
+    }
+
     $epoch_min = min($epochs);
     $epoch_max = max($epochs);