Fallback for context with http context exists.

src/Squidex.Web/ContextProvider.cs

@@ -5,6 +5,7 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using System.Threading;
 using Microsoft.AspNetCore.Http;
 using Squidex.Domain.Apps.Entities;
 using Squidex.Infrastructure;
@@ -14,10 +15,24 @@ namespace Squidex.Web
     public sealed class ContextProvider : IContextProvider
     {
         private readonly IHttpContextAccessor httpContextAccessor;
+        private readonly AsyncLocal<Context> asyncLocal = new AsyncLocal<Context>();
 
         public Context Context
         {
-            get { return httpContextAccessor.HttpContext.Context(); }
+            get
+            {
+                if (httpContextAccessor.HttpContext == null)
+                {
+                    if (asyncLocal.Value == null)
+                    {
+                        asyncLocal.Value = new Context();
+                    }
+
+                    return asyncLocal.Value;
+                }
+
+                return httpContextAccessor.HttpContext.Context();
+            }
         }
 
         public ContextProvider(IHttpContextAccessor httpContextAccessor)