diff --git a/modules/openapi-generator/src/main/resources/php-symfony/model_generic.mustache b/modules/openapi-generator/src/main/resources/php-symfony/model_generic.mustache
index 9dba64f5345c..962a4cdb2d59 100644
--- a/modules/openapi-generator/src/main/resources/php-symfony/model_generic.mustache
+++ b/modules/openapi-generator/src/main/resources/php-symfony/model_generic.mustache
@@ -52,7 +52,7 @@ class {{classname}} {{#parentSchema}}extends {{{parent}}} {{/parentSchema}}
     */
     public function getSerialized{{nameInPascalCase}}(): string|null
     {
-        return $this->{{name}}?->value ? (string) $this->{{name}}->value : null;
+        return !is_null($this->{{name}}?->value) ? (string) $this->{{name}}->value : null;
     }
 
     /**