diff --git a/src/Generator/TypeGenerator.php b/src/Generator/TypeGenerator.php
index 0d7fc532..ee77d324 100644
--- a/src/Generator/TypeGenerator.php
+++ b/src/Generator/TypeGenerator.php
@@ -69,7 +69,7 @@ public static function fromReflectionType(
 
         return new self(
             $atomicType,
-            $atomicType->type !== 'mixed' && $atomicType !== 'null' && $type->allowsNull()
+            $atomicType->type !== 'mixed' && $atomicType->type !== 'null' && $type->allowsNull()
         );
     }