How to prevent member from an empty variable error?

An error occurred while executing object list data source nanoflow for widget NativeMobile.PageName.listview: Unable to get a member from an empty variable.  The above error occurs when i click android device back button or when close page activity is used to go back to previous page in native application.   Thanks.
1 answers

The previous page you are trying to go to probably have a listview that is accessing a member of some object which is empty. Please inspect your data source and see if the object being returned there is not empty. 

Further if you share some screenshots of your page and relevant nanoflow, it would be helpful to resolve the issue.