diff --git a/SpeckleCore/Converter.cs b/SpeckleCore/Converter.cs
index c72be52..b58d2ce 100644
--- a/SpeckleCore/Converter.cs
+++ b/SpeckleCore/Converter.cs
@@ -107,7 +107,8 @@ public static List<SpeckleObject> Serialise( IEnumerable<object> objectList )
     /// <returns>A native type, a SpeckleAbstract if no explicit conversion found, or null.</returns>
     public static List<object> Deserialise( IEnumerable<SpeckleObject> objectList )
     {
-      return objectList.Select( obj => Deserialise( obj ) ).ToList();
+      var copy = objectList.ToArray();
+      return copy.Select( obj => Deserialise( obj ) ).ToList();
     }
 
     /// <summary>                                                  
diff --git a/SpeckleCore/GzipContent.cs b/SpeckleCore/GzipContent.cs
index 307dc03..c6f9bb1 100644
--- a/SpeckleCore/GzipContent.cs
+++ b/SpeckleCore/GzipContent.cs
@@ -10,46 +10,50 @@
 
 namespace SpeckleCore
 {
-    /// <summary>
-    /// https://cymbeline.ch/2014/03/16/gzip-encoding-an-http-post-request-body/
-    /// </summary>
-    internal sealed class GzipContent : HttpContent
-    {
-        private readonly HttpContent content;
-
-        public GzipContent(HttpContent content)
-        {
-            this.content = content;
-
+  /// <summary>
+  /// https://cymbeline.ch/2014/03/16/gzip-encoding-an-http-post-request-body/
+  /// </summary>
+  internal sealed class GzipContent : HttpContent
+  {
+    private readonly HttpContent content;
 
-            // Keep the original content's headers ...
-            if (content != null)
-                foreach (KeyValuePair<string, IEnumerable<string>> header in content.Headers)
-                {
-                    Headers.TryAddWithoutValidation(header.Key, header.Value);
-                }
+    public GzipContent( HttpContent content )
+    {
+      if(content == null)
+      {
+        return;
+      }
 
-            // ... and let the server know we've Gzip-compressed the body of this request.
-            Headers.ContentEncoding.Add("gzip");
-        }
+      this.content = content;
 
-        protected override async Task SerializeToStreamAsync(Stream stream, TransportContext context)
+      // Keep the original content's headers ...
+      if ( content != null )
+        foreach ( KeyValuePair<string, IEnumerable<string>> header in content.Headers )
         {
-            // Open a GZipStream that writes to the specified output stream.
-            using (GZipStream gzip = new GZipStream(stream, CompressionMode.Compress, true))
-            {
-                // Copy all the input content to the GZip stream.
-                if (content != null)
-                    await content.CopyToAsync(gzip);
-                else
-                    await (new System.Net.Http.StringContent(string.Empty)).CopyToAsync(gzip);
-            }
+          Headers.TryAddWithoutValidation( header.Key, header.Value );
         }
 
-        protected override bool TryComputeLength(out long length)
-        {
-            length = -1;
-            return false;
-        }
+      // ... and let the server know we've Gzip-compressed the body of this request.
+      Headers.ContentEncoding.Add( "gzip" );
+    }
+
+    protected override async Task SerializeToStreamAsync( Stream stream, TransportContext context )
+    {
+      // Open a GZipStream that writes to the specified output stream.
+      using ( GZipStream gzip = new GZipStream( stream, CompressionMode.Compress, true ) )
+      {
+        // Copy all the input content to the GZip stream.
+        if ( content != null )
+          await content.CopyToAsync( gzip );
+        else
+          await ( new System.Net.Http.StringContent( string.Empty ) ).CopyToAsync( gzip );
+      }
+    }
+
+    protected override bool TryComputeLength( out long length )
+    {
+      length = -1;
+      return false;
     }
+  }
 }
diff --git a/SpeckleCore/SpeckleApiClientApiCalls.cs b/SpeckleCore/SpeckleApiClientApiCalls.cs
index 29efd5b..1b32e2b 100644
--- a/SpeckleCore/SpeckleApiClientApiCalls.cs
+++ b/SpeckleCore/SpeckleApiClientApiCalls.cs
@@ -2724,7 +2724,6 @@ public async System.Threading.Tasks.Task<ResponseStreamClone> StreamCloneAsync(
       {
         using ( var request_ = new System.Net.Http.HttpRequestMessage() )
         {
-          request_.Content = new System.Net.Http.StringContent( string.Empty, System.Text.Encoding.UTF8, "application/json" );
           request_.Method = new System.Net.Http.HttpMethod( "POST" );
           request_.Headers.Accept.Add( new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue( "application/json" ) );