diff --git a/src/Squidex/Controllers/Api/Assets/AssetContentController.cs b/src/Squidex/Controllers/Api/Assets/AssetContentController.cs
index efae49e6f..d8ac35e3e 100644
--- a/src/Squidex/Controllers/Api/Assets/AssetContentController.cs
+++ b/src/Squidex/Controllers/Api/Assets/AssetContentController.cs
@@ -47,7 +47,7 @@ namespace Squidex.Controllers.Api.Assets
         {
             var asset = await assetRepository.FindAssetAsync(id);
 
-            if (asset == null || asset.FileVersion < version)
+            if (asset == null || asset.FileVersion < version || width == 0 || height == 0)
             {
                 return NotFound();
             }
diff --git a/src/Squidex/Pipeline/FileCallbackResultExecutor.cs b/src/Squidex/Pipeline/FileCallbackResultExecutor.cs
index 70068424e..355d0f48c 100644
--- a/src/Squidex/Pipeline/FileCallbackResultExecutor.cs
+++ b/src/Squidex/Pipeline/FileCallbackResultExecutor.cs
@@ -6,6 +6,7 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Internal;
@@ -28,8 +29,10 @@ namespace Squidex.Pipeline
 
                 await result.Callback(context.HttpContext.Response.Body);
             }
-            catch
+            catch (Exception e)
             {
+                Logger.LogCritical(new EventId(99), e, "Failed to send result.");
+
                 context.HttpContext.Response.Headers.Clear();
                 context.HttpContext.Response.StatusCode = 404;
             }