diff --git a/src/applications/config/check/PhabricatorSetupCheck.php b/src/applications/config/check/PhabricatorSetupCheck.php
--- a/src/applications/config/check/PhabricatorSetupCheck.php
+++ b/src/applications/config/check/PhabricatorSetupCheck.php
@@ -122,7 +122,7 @@
     $db_cache = new PhabricatorKeyValueDatabaseCache();
     try {
       $value = $db_cache->getKey('phabricator.setup.issue-keys');
-      if (!strlen($value)) {
+      if (!phutil_nonempty_string($value)) {
         return null;
       }
       return phutil_json_decode($value);