Ah yes I do, sorry I didn't notice previously. Here is what I get upon saving.
NullReferenceException: Object reference not set to an instance of an object
AmplifyShaderEditor.OutlineNode.PropagateNodeData (NodeData nodeData, AmplifyShaderEditor.MasterNodeDataCollector& dataCollector) (at Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Vertex/OutlineNode.cs:85)
AmplifyShaderEditor.MasterNode.SetupNodeCategories () (at Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Master/MasterNode.cs:174)
AmplifyShaderEditor.TemplateMultiPassMasterNode.CollectData () (at Assets/AmplifyShaderEditor/Plugins/Editor/Templates/TemplateMultiPassMasterNode.cs:1301)
AmplifyShaderEditor.TemplateMultiPassMasterNode.BuildShaderBody () (at Assets/AmplifyShaderEditor/Plugins/Editor/Templates/TemplateMultiPassMasterNode.cs:1249)
AmplifyShaderEditor.TemplateMultiPassMasterNode.Execute (System.String pathname, Boolean isFullPath) (at Assets/AmplifyShaderEditor/Plugins/Editor/Templates/TemplateMultiPassMasterNode.cs:1286)
AmplifyShaderEditor.MasterNode.Execute (UnityEngine.Shader selectedShader) (at Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Master/MasterNode.cs:470)
AmplifyShaderEditor.ParentGraph.FireMasterNode (UnityEngine.Shader selectedShader) (at Assets/AmplifyShaderEditor/Plugins/Editor/Graphs/ParentGraph.cs:2573)
AmplifyShaderEditor.AmplifyShaderEditorWindow.SaveToDisk (Boolean checkTimestamp) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:1421)
AmplifyShaderEditor.AmplifyShaderEditorWindow.OnToolButtonPressed (ToolButtonType type) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:1516)
AmplifyShaderEditor.ToolsWindow.OnButtonPressedEvent (ToolButtonType type) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/Tools/ToolsWindow.cs:206)
AmplifyShaderEditor.ToolsMenuButton.Draw (Single x, Single y) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/Tools/ToolsMenuButton.cs:172)
AmplifyShaderEditor.ToolsWindow.Draw (Rect parentPosition, Vector2 mousePosition, Int32 mouseButtonId, Boolean hasKeyboadFocus) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/Tools/ToolsWindow.cs:234)
AmplifyShaderEditor.AmplifyShaderEditorWindow.OnGUI () (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:4343)
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:295)
UnityEditor.HostView.Invoke (System.String methodName) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:288)
UnityEditor.HostView.InvokeOnGUI (Rect onGUIPosition) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:255)
I've also attached my very simple graph setup