Unity 5.6.0p4 + SF 1.36 Asert

We have updated to the latest version of SF 1.36 and recently upgraded our project to Unity 5.6.0p4 but we are getting an asset in Unity when ever we select a .shader file?

Error code:

NullReferenceException: Object reference not set to an instance of an object

UnityEditor.ShaderForgeInspector.ShowCompiledCodeButton (UnityEngine.Shader s) (at Assets/3rd Party/ShaderForge/Editor/InternalResources/Inspectors/ShaderForgeInspector.cs:334)
UnityEditor.ShaderForgeInspector.ShowShaderCodeArea (UnityEngine.Shader s) (at Assets/3rd Party/ShaderForge/Editor/InternalResources/Inspectors/ShaderForgeInspector.cs:294)
UnityEditor.ShaderForgeInspector.DrawUnitysInspector () (at Assets/3rd Party/ShaderForge/Editor/InternalResources/Inspectors/ShaderForgeInspector.cs:264)
UnityEditor.ShaderForgeInspector.OnInspectorGUI () (at Assets/3rd Party/ShaderForge/Editor/InternalResources/Inspectors/ShaderForgeInspector.cs:213)
UnityEditor.InspectorWindow.DrawEditor (UnityEditor.Editor editor, Int32 editorIndex, Boolean rebuildOptimizedGUIBlock, System.Boolean& showImportedObjectBarNext, UnityEngine.Rect& importedObjectBarRect) (at C:/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:1229)
UnityEditor.DockArea:OnGUI()