diff --git a/Iceshrimp.Backend/Core/Federation/ActivityPub/ActivityHandlerService.cs b/Iceshrimp.Backend/Core/Federation/ActivityPub/ActivityHandlerService.cs
index 123add32..826a4efe 100644
--- a/Iceshrimp.Backend/Core/Federation/ActivityPub/ActivityHandlerService.cs
+++ b/Iceshrimp.Backend/Core/Federation/ActivityPub/ActivityHandlerService.cs
@@ -86,7 +86,8 @@ public class ActivityHandlerService(
 				}
 
 				if (activity.Object is not ASTombstone tombstone)
-					throw GracefulException.UnprocessableEntity("Delete activity object is invalid");
+					throw GracefulException
+						.UnprocessableEntity($"Delete activity object is invalid: {activity.Object.Type}");
 				if (await db.Notes.AnyAsync(p => p.Uri == tombstone.Id))
 				{
 					await noteSvc.DeleteNoteAsync(tombstone, resolvedActor);