diff --git a/backend/src/Notifo.Domain/UserNotifications/UserNotificationStore.cs b/backend/src/Notifo.Domain/UserNotifications/UserNotificationStore.cs
index 04ebb5f9..a35adb6c 100644
--- a/backend/src/Notifo.Domain/UserNotifications/UserNotificationStore.cs
+++ b/backend/src/Notifo.Domain/UserNotifications/UserNotificationStore.cs
@@ -214,7 +214,10 @@ public Task InsertAsync(UserNotification notification,
     public Task TrackAsync(TrackingKey identifier, DeliveryResult result,
         CancellationToken ct = default)
     {
-        Guard.NotNullOrEmpty(identifier.Channel);
+        if (string.IsNullOrWhiteSpace(identifier.Channel))
+        {
+            return Task.CompletedTask;
+        }
 
         var counterMap = CounterMap.ForChannel(identifier.Channel!, result.Status);
         var counterKey = identifier;
diff --git a/frontend/src/app/style/_common.scss b/frontend/src/app/style/_common.scss
index 00d39fde..fe942f1f 100644
--- a/frontend/src/app/style/_common.scss
+++ b/frontend/src/app/style/_common.scss
@@ -1262,7 +1262,7 @@ em-emoji-picker {
 
 .loader {
     div {
-        display: inline-block;
+        display: inline-block !important;
     }
 }
 
diff --git a/frontend/src/sdk/ui/style/sdk.scss b/frontend/src/sdk/ui/style/sdk.scss
index ee9c83f1..03a16107 100644
--- a/frontend/src/sdk/ui/style/sdk.scss
+++ b/frontend/src/sdk/ui/style/sdk.scss
@@ -6,6 +6,7 @@
     @import 'components';
     @import 'notifications';
     @import 'topics';
+    line-height: 1.5;
 
     .notifo {
         &-button {