diff --git a/src/applications/phame/storage/PhameBlogTransaction.php b/src/applications/phame/storage/PhameBlogTransaction.php
--- a/src/applications/phame/storage/PhameBlogTransaction.php
+++ b/src/applications/phame/storage/PhameBlogTransaction.php
@@ -15,6 +15,10 @@
     return PhabricatorPhameBlogPHIDType::TYPECONST;
   }
 
+  public function getApplicationTransactionCommentObject() {
+    return null;
+  }
+
   public function getBaseTransactionClass() {
     return 'PhameBlogTransactionType';
   }
diff --git a/src/applications/project/storage/PhabricatorProjectTransaction.php b/src/applications/project/storage/PhabricatorProjectTransaction.php
--- a/src/applications/project/storage/PhabricatorProjectTransaction.php
+++ b/src/applications/project/storage/PhabricatorProjectTransaction.php
@@ -19,6 +19,10 @@
     return PhabricatorProjectProjectPHIDType::TYPECONST;
   }
 
+  public function getApplicationTransactionCommentObject() {
+    return null;
+  }
+
   public function getBaseTransactionClass() {
     return 'PhabricatorProjectTransactionType';
   }