Error on unity load

Happen every time the shader window is open with a shader loaded when quitting unity and reopening I get the follow error that causes the shader editor to close

NullReferenceException: Object reference not set to an instance of an object
ShaderForge.SF_Evaluator.Evaluate ()
ShaderForge.SF_Editor.OnDisable ()
UnityEditor.EditorWindow:Close()
ShaderForge.SF_Editor:Update()
UnityEditor.EditorApplication:Internal_CallUpdateFunctions()