diff --git a/Base/Model.php b/Base/Model.php
index 1467a02..9c5801a 100644
--- a/Base/Model.php
+++ b/Base/Model.php
@@ -223,8 +223,8 @@ abstract class Model extends Component implements ModelInterface, ArrayAccess, \
      */
     public function getPrimaryValue(): ?int
     {
-        if ($this->hasPrimary()) {
-            return (int)$this->_oldAttributes[$this->getPrimary()] ?? null;
+        if ($this->hasPrimary() && isset($this->_oldAttributes[$this->getPrimary()])) {
+            return (int)$this->_oldAttributes[$this->getPrimary()];
         } else {
             return null;
         }