diff --git a/src/Entity/QRCode/QRCodePaymentIdentification.php b/src/Entity/QRCode/QRCodePaymentIdentification.php
index cb777b1..5474120 100644
--- a/src/Entity/QRCode/QRCodePaymentIdentification.php
+++ b/src/Entity/QRCode/QRCodePaymentIdentification.php
@@ -13,17 +13,17 @@ class QRCodePaymentIdentification {
     #[BankPaymentIdentificationNumber(
         message: 'messages.not_variable_symbol',
     )]
-    private ?string $variableSymbol;
+    private ?string $variableSymbol = null;
 
     #[BankPaymentIdentificationNumber(
         message: 'messages.not_specific_symbol',
     )]
-    private ?string $specificSymbol;
+    private ?string $specificSymbol = null;
 
     #[BankPaymentIdentificationNumber(
         message: 'messages.not_constant_symbol',
     )]  // https://www.hyponamiru.cz/en/glossary/constant-symbol/
-    private ?string $constantSymbol;
+    private ?string $constantSymbol = null;
 
     public function getVariableSymbol(): ?string
     {