diff --git a/src/System.Management.Automation/engine/InternalCommands.cs b/src/System.Management.Automation/engine/InternalCommands.cs
index 373098bf95..78338e08cc 100644
--- a/src/System.Management.Automation/engine/InternalCommands.cs
+++ b/src/System.Management.Automation/engine/InternalCommands.cs
@@ -509,7 +509,8 @@ namespace Microsoft.PowerShell.Commands
         private void ProcessParallelParameterSet()
         {
             // Validate piped InputObject
-            if (_inputObject.BaseObject is ScriptBlock)
+            if (_inputObject != null && 
+                _inputObject.BaseObject is ScriptBlock)
             {
                 WriteError(
                     new ErrorRecord(