diff --git a/packages/former/src/utils.ts b/packages/former/src/utils.ts
index 1c051c3..6b07c03 100644
--- a/packages/former/src/utils.ts
+++ b/packages/former/src/utils.ts
@@ -238,7 +238,7 @@ export function unsetDataOfNode(node: InternalSchemaNode, data: FormData | Field
     return;
   }
   if (node.name) {
-    data[node.name] = undefined;
+    delete data[node.name];
   }
   else if (isNodeLayoutComponent(node, components) && node.children) {
     let children = node.children;