diff --git a/packages/lib/defaultEvents.ts b/packages/lib/defaultEvents.ts
index a04887b4..861b16da 100644
--- a/packages/lib/defaultEvents.ts
+++ b/packages/lib/defaultEvents.ts
@@ -139,8 +139,9 @@ export const getUsernameSlugLink = ({ users, slug }: UsernameSlugLinkProps): str
 };
 
 export const getUsernameList = (users: string): string[] => {
+  // For Team booking, users might be undefined
   return users
-    .toLowerCase()
+    ?.toLowerCase()
     .replace(" ", "+")
     .replace("%20", "+")
     .split("+")