diff --git a/serializer.js b/serializer.js
index e939f9a..b6edb0e 100644
--- a/serializer.js
+++ b/serializer.js
@@ -193,7 +193,7 @@ class Serializer {
 				}
 			} else {
 				let d = f.serialize();
-				if (f !== null) {
+				if (d !== null) {
 					if (k == "") {
 						json = d;
 						continue;
@@ -202,8 +202,7 @@ class Serializer {
 				}
 			}
 		}
-		return json;
-	}
+		return Object.keys(json).length > 0 ? json : null;}
 }
 
 class Validator {