diff --git a/workflow/engine/methods/enterprise/enterprise.php b/workflow/engine/methods/enterprise/enterprise.php
index 0be22eedc..b291e204c 100644
--- a/workflow/engine/methods/enterprise/enterprise.php
+++ b/workflow/engine/methods/enterprise/enterprise.php
@@ -220,6 +220,8 @@ class enterprisePlugin extends PMPlugin
         $value = Cache::get($cacheKey, function () {
             if (file_exists(PATH_DATA_SITE . "ee")) {
                 return trim(file_get_contents(PATH_DATA_SITE . "ee"));
+            } else {
+                return null;
             }
         });
         if ($value) {