diff --git a/backend/src/Squidex.Domain.Apps.Entities/Backup/RestoreGrain.cs b/backend/src/Squidex.Domain.Apps.Entities/Backup/RestoreGrain.cs
index 2831fda7b..f40e9e813 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Backup/RestoreGrain.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Backup/RestoreGrain.cs
@@ -334,7 +334,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
                 await CreateContextAsync(reader);
             }
 
-            if (@event.Payload is SquidexEvent squidexEvent)
+            if (@event.Payload is SquidexEvent squidexEvent && squidexEvent.Actor != null)
             {
                 if (restoreContext.UserMapping.TryMap(squidexEvent.Actor, out var newUser))
                 {