diff --git a/src/Utility/Utility.php b/src/Utility/Utility.php
index b623c7da..3106395b 100644
--- a/src/Utility/Utility.php
+++ b/src/Utility/Utility.php
@@ -141,3 +141,3 @@ class Utility {
     $function = $separate_last ? 'strrpos' : 'strpos';
-    $pos = $function($property_path, $separator);
+    $pos = $function($property_path ?? '', $separator);
     if ($pos !== FALSE) {