diff --git a/web/repertory/lib/models/mount_list.dart b/web/repertory/lib/models/mount_list.dart
index 86bc16ec..309cfb7d 100644
--- a/web/repertory/lib/models/mount_list.dart
+++ b/web/repertory/lib/models/mount_list.dart
@@ -12,7 +12,7 @@ class MountList with ChangeNotifier {
     MountConfig? item = _items.firstWhereOrNull(
       (cfg) => cfg.name == config.name,
     );
-    if (item == null) {
+    if (item != null) {
       throw DuplicateMountException(name: config.name);
     }