diff --git a/src/js/room-picker.js b/src/js/room-picker.js
index d2e79fa..5a5340c 100644
--- a/src/js/room-picker.js
+++ b/src/js/room-picker.js
@@ -106,8 +106,12 @@ class Room extends ElemJS {
 		}
 		// if the room has no alias, use the names of its members ("heroes")
 		const users = this.data.summary["m.heroes"]
-		const usernames = users.map(u => (u.match(/^@([^:]+):/) || [])[1] || u)
-		return usernames.join(", ")
+		if (users && users.length) {
+			const usernames = users.map(u => (u.match(/^@([^:]+):/) || [])[1] || u)
+			return usernames.join(", ")
+		}
+		// the room is empty
+		return "Empty room"
 	}
 
 	getIcon() {