bugfix create customfields

zimbraSingle.php

@@ -102,7 +102,7 @@ function zimbraSingleCreateCustomFields($packageconfigoption)
             ->where('relid', '=', $productID)
             ->select('id')
             ->get();
-        $customFieldIDs = recursiveFindAll($customFieldIDsObj, 'id');
+        $customFieldIDs = recursiveFindAll((array)$customFieldIDsObj, 'id');
         logModuleCall(
             'zimbrasingle',
             __FUNCTION__,