diff --git a/packages/td-tools/src/td-parser.ts b/packages/td-tools/src/td-parser.ts
index bc2b835b4..6612767aa 100644
--- a/packages/td-tools/src/td-parser.ts
+++ b/packages/td-tools/src/td-parser.ts
@@ -269,7 +269,7 @@ export function serializeTD(thing: Thing): string {
         delete copy.events;
     }
 
-    if (copy.links !== undefined && copy.links.length === 0) {
+    if (copy?.links.length === 0) {
         delete copy.links;
     }