diff --git a/plugins/contact/src/utils.ts b/plugins/contact/src/utils.ts
index 91c0a51e80..3b3916dd52 100644
--- a/plugins/contact/src/utils.ts
+++ b/plugins/contact/src/utils.ts
@@ -233,7 +233,7 @@ const SEP = ','
  * @public
  */
 export function combineName (first: string, last: string): string {
-  return last + SEP + first
+  return (last ?? '') + SEP + (first ?? '')
 }
 
 /**