diff --git a/src/applications/phame/controller/PhameLiveController.php b/src/applications/phame/controller/PhameLiveController.php
--- a/src/applications/phame/controller/PhameLiveController.php
+++ b/src/applications/phame/controller/PhameLiveController.php
@@ -87,7 +87,7 @@
     $this->isExternal = $is_external;
     $this->isLive = $is_live;
 
-    if (strlen($post_id)) {
+    if (phutil_nonempty_string($post_id)) {
       $post_query = id(new PhamePostQuery())
         ->setViewer($viewer)
         ->needHeaderImage(true)