diff --git a/src/Microsoft.AspNetCore.NodeServices/HostingModels/InputOutputStreamNodeInstance.cs b/src/Microsoft.AspNetCore.NodeServices/HostingModels/InputOutputStreamNodeInstance.cs
index ffa2cdca..3060c94c 100644
--- a/src/Microsoft.AspNetCore.NodeServices/HostingModels/InputOutputStreamNodeInstance.cs
+++ b/src/Microsoft.AspNetCore.NodeServices/HostingModels/InputOutputStreamNodeInstance.cs
@@ -62,7 +62,7 @@ public override async Task<T> Invoke<T>(NodeInvocationInfo invocationInfo)
 
         protected override void OnOutputDataReceived(string outputData)
         {
-            if (_currentInvocationResult != null)
+            if (_currentInvocationResult != null && outputData.Contains("{"))
             {
                 _currentInvocationResult.SetResult(outputData);
             }