diff --git a/src/view/phui/PHUIActionPanelView.php b/src/view/phui/PHUIActionPanelView.php
--- a/src/view/phui/PHUIActionPanelView.php
+++ b/src/view/phui/PHUIActionPanelView.php
@@ -111,7 +111,7 @@
     }
 
     $header = null;
-    if ($this->header) {
+    if (strlen($this->header)) {
       $header = phutil_tag(
         'span',
         array(
@@ -121,7 +121,7 @@
     }
 
     $subheader = null;
-    if ($this->subHeader) {
+    if (strlen($this->subHeader)) {
       $subheader = phutil_tag(
         'span',
         array(