diff --git a/Emby.Naming/Video/VideoListResolver.cs b/Emby.Naming/Video/VideoListResolver.cs
index a4f1d4c78..11f82525f 100644
--- a/Emby.Naming/Video/VideoListResolver.cs
+++ b/Emby.Naming/Video/VideoListResolver.cs
@@ -29,7 +29,7 @@ namespace Emby.Naming.Video
                 .Where(i => i.ExtraType == null)
                 .Select(i => new FileSystemMetadata { FullName = i.Path, IsDirectory = i.IsDirectory });
 
-            var stackResult = StackResolver.Resolve(nonExtras, namingOptions);
+            var stackResult = StackResolver.Resolve(nonExtras, namingOptions).ToList();
 
             var remainingFiles = new List<VideoFileInfo>();
             var standaloneMedia = new List<VideoFileInfo>();
diff --git a/Emby.Server.Implementations/Collections/CollectionManager.cs b/Emby.Server.Implementations/Collections/CollectionManager.cs
index 1bbcbe2dd..213c3dccc 100644
--- a/Emby.Server.Implementations/Collections/CollectionManager.cs
+++ b/Emby.Server.Implementations/Collections/CollectionManager.cs
@@ -210,7 +210,7 @@ namespace Emby.Server.Implementations.Collections
             var itemList = new List<BaseItem>();
 
             var linkedChildrenList = collection.GetLinkedChildren();
-            var currentLinkedChildrenIds = linkedChildrenList.Select(i => i.Id);
+            var currentLinkedChildrenIds = linkedChildrenList.Select(i => i.Id).ToList();
 
             foreach (var id in ids)
             {
@@ -300,7 +300,7 @@ namespace Emby.Server.Implementations.Collections
         {
             var results = new Dictionary<Guid, BaseItem>();
 
-            var allBoxSets = GetCollections(user);
+            var allBoxSets = GetCollections(user).ToList();
 
             foreach (var item in items)
             {
diff --git a/Emby.Server.Implementations/Library/LibraryManager.cs b/Emby.Server.Implementations/Library/LibraryManager.cs
index 9053449ab..c2a1f4dde 100644
--- a/Emby.Server.Implementations/Library/LibraryManager.cs
+++ b/Emby.Server.Implementations/Library/LibraryManager.cs
@@ -356,7 +356,7 @@ namespace Emby.Server.Implementations.Library
             }
 
             var children = item.IsFolder
-                ? ((Folder)item).GetRecursiveChildren(false)
+                ? ((Folder)item).GetRecursiveChildren(false).ToList()
                 : new List<BaseItem>();
 
             foreach (var metadataPath in GetMetadataPaths(item, children))
@@ -612,7 +612,8 @@ namespace Emby.Server.Implementations.Library
 
             var list = originalList.Where(i => i.IsDirectory)
                 .Select(i => _fileSystem.NormalizePath(i.FullName))
-                .Distinct(StringComparer.OrdinalIgnoreCase);
+                .Distinct(StringComparer.OrdinalIgnoreCase)
+                .ToList();
 
             var dupes = list.Where(subPath => !subPath.EndsWith(":\\", StringComparison.OrdinalIgnoreCase) && list.Any(i => _fileSystem.ContainsSubPath(i, subPath)));