diff --git a/src/Microsoft.OpenApi/Services/OpenApiWalker.cs b/src/Microsoft.OpenApi/Services/OpenApiWalker.cs
index 78ca5e61b..8c469261c 100644
--- a/src/Microsoft.OpenApi/Services/OpenApiWalker.cs
+++ b/src/Microsoft.OpenApi/Services/OpenApiWalker.cs
@@ -274,7 +274,7 @@ internal void Walk(IOpenApiExtensible openApiExtensible)
 
             _visitor.Visit(openApiExtensible);
 
-            if (openApiExtensible != null)
+            if (openApiExtensible.Extensions != null)
             {
                 foreach (var item in openApiExtensible.Extensions)
                 {