diff --git a/src/applications/project/conduit/ProjectCreateConduitAPIMethod.php b/src/applications/project/conduit/ProjectCreateConduitAPIMethod.php
--- a/src/applications/project/conduit/ProjectCreateConduitAPIMethod.php
+++ b/src/applications/project/conduit/ProjectCreateConduitAPIMethod.php
@@ -43,7 +43,10 @@
 
     $project = PhabricatorProject::initializeNewProject($user);
     $type_name = PhabricatorProjectNameTransaction::TRANSACTIONTYPE;
-    $members = $request->getValue('members');
+    $members = [];
+    if ($request->getValue('members')) {
+      $members = $request->getValue('members');
+    }
     $xactions = array();
 
     $xactions[] = id(new PhabricatorProjectTransaction())