diff --git a/src/Microsoft.AspNetCore.SignalR/JsonNetInvocationAdapter.cs b/src/Microsoft.AspNetCore.SignalR/JsonNetInvocationAdapter.cs
index 7f01f906ee..4657f25697 100644
--- a/src/Microsoft.AspNetCore.SignalR/JsonNetInvocationAdapter.cs
+++ b/src/Microsoft.AspNetCore.SignalR/JsonNetInvocationAdapter.cs
@@ -25,6 +25,11 @@ namespace Microsoft.AspNetCore.SignalR
             return Task.Run(() =>
             {
                 var jsonInvocation = _serializer.Deserialize<JsonNetInvocationDescriptor>(reader);
+                if (jsonInvocation == null)
+                {
+                    return null;
+                }
+
                 var invocation = new InvocationDescriptor
                 {
                     Id = jsonInvocation.Id,