diff --git a/Generator/Normalizer/NormalizerGenerator.php b/Generator/Normalizer/NormalizerGenerator.php
index 1e05cd2..8549b7b 100644
--- a/Generator/Normalizer/NormalizerGenerator.php
+++ b/Generator/Normalizer/NormalizerGenerator.php
@@ -124,13 +124,20 @@ protected function createNormalizeMethod(string $modelFqdn, Context $context, Cl
                 }
 
                 if (!$property->isRequired()) {
-                    $statements[] = new Stmt\If_(
-                        new Expr\BinaryOp\BooleanAnd(
+                    if ($property->isNullable()) {
+                        $statements[] = new Stmt\If_(
                             new Expr\MethodCall($objectVariable, 'isInitialized', [new Arg(new Scalar\String_($property->getPhpName()))]),
-                            new Expr\BinaryOp\NotIdentical(new Expr\ConstFetch(new Name('null')), $propertyVar)
-                        ),
-                        ['stmts' => $normalizationStatements]
-                    );
+                            ['stmts' => $normalizationStatements]
+                        );
+                    } else {
+                        $statements[] = new Stmt\If_(
+                            new Expr\BinaryOp\BooleanAnd(
+                                new Expr\MethodCall($objectVariable, 'isInitialized', [new Arg(new Scalar\String_($property->getPhpName()))]),
+                                new Expr\BinaryOp\NotIdentical(new Expr\ConstFetch(new Name('null')), $propertyVar)
+                            ),
+                            ['stmts' => $normalizationStatements]
+                        );
+                    }
                 } else {
                     $statements[] = new Stmt\If_(
                         new Expr\BinaryOp\NotIdentical(new Expr\ConstFetch(new Name('null')), $propertyVar),
diff --git a/Guesser/Guess/CheckNullableTrait.php b/Guesser/Guess/CheckNullableTrait.php
index 067de0c..d72d8ac 100644
--- a/Guesser/Guess/CheckNullableTrait.php
+++ b/Guesser/Guess/CheckNullableTrait.php
@@ -15,7 +15,7 @@ public function isNullable($schema): bool
             return $schema->offsetExists('x-nullable') && \is_bool($schema->offsetGet('x-nullable')) && $schema->offsetGet('x-nullable');
         }
         if (\get_class($schema) === 'Jane\\Component\\OpenApi3\\JsonSchema\\Model\\Schema') {
-            return method_exists($schema, 'getNullable') && !($schema->getNullable() ?? false);
+            return method_exists($schema, 'getNullable') && $schema->getNullable() === true;
         }
 
         return false;