diff --git a/src/applications/harbormaster/editor/HarbormasterBuildPlanEditEngine.php b/src/applications/harbormaster/editor/HarbormasterBuildPlanEditEngine.php
--- a/src/applications/harbormaster/editor/HarbormasterBuildPlanEditEngine.php
+++ b/src/applications/harbormaster/editor/HarbormasterBuildPlanEditEngine.php
@@ -103,7 +103,7 @@
         $key);
       $behavior_option = $object->getPlanProperty($storage_key);
 
-      if (!strlen($behavior_option)) {
+      if (!phutil_nonempty_string($behavior_option)) {
         $behavior_option = $behavior->getPlanOption($object)->getKey();
       }