diff --git a/frontend/src/routes/briefwechsel/+page.svelte b/frontend/src/routes/briefwechsel/+page.svelte
index 53f095f7..d4383e8f 100644
--- a/frontend/src/routes/briefwechsel/+page.svelte
+++ b/frontend/src/routes/briefwechsel/+page.svelte
@@ -86,6 +86,7 @@ function swapPersons() {
 }
 
 function selectPerson(id: string) {
+	if (!id) return;
 	senderId = id;
 	receiverId = '';
 	applyFilters();