diff --git a/backend/src/Squidex.Domain.Apps.Entities/Apps/Indexes/AppsIndex.cs b/backend/src/Squidex.Domain.Apps.Entities/Apps/Indexes/AppsIndex.cs
index 156b04edb..688d2204f 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Apps/Indexes/AppsIndex.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Apps/Indexes/AppsIndex.cs
@@ -95,7 +95,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 
                 var apps =
                     await Task.WhenAll(ids
-                        .SelectMany(x => x)
+                        .SelectMany(x => x).Distinct()
                         .Select(GetAppAsync));
 
                 return apps.Where(x => x != null).ToList();
diff --git a/backend/src/Squidex.Domain.Apps.Entities/Backup/UserMapping.cs b/backend/src/Squidex.Domain.Apps.Entities/Backup/UserMapping.cs
index 7fddf3a3e..9d273dbbc 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Backup/UserMapping.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Backup/UserMapping.cs
@@ -33,7 +33,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
 
         public void Backup(RefToken token)
         {
-            Guard.NotNull(userMap);
+            Guard.NotNull(token);
 
             if (!token.IsSubject)
             {
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Indexes/AppsIndexTests.cs b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Indexes/AppsIndexTests.cs
index 7767f082c..fa487905d 100644
--- a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Indexes/AppsIndexTests.cs
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Indexes/AppsIndexTests.cs
@@ -70,6 +70,23 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
             Assert.Same(expected, actual[0]);
         }
 
+        [Fact]
+        public async Task Should_resolve_combined_apps()
+        {
+            var expected = SetupApp(0, false);
+
+            A.CallTo(() => indexByName.GetIdsAsync(A<string[]>.That.IsSameSequenceAs(new[] { appId.Name })))
+                .Returns(new List<Guid> { appId.Id });
+
+            A.CallTo(() => indexByUser.GetIdsAsync())
+                .Returns(new List<Guid> { appId.Id });
+
+            var actual = await sut.GetAppsForUserAsync(userId, new PermissionSet($"squidex.apps.{appId.Name}"));
+
+            Assert.Single(actual);
+            Assert.Same(expected, actual[0]);
+        }
+
         [Fact]
         public async Task Should_resolve_all_apps()
         {