where is the error in pagination?

i have a django project  and it includes pagination i do not know where is the error in my code but once i tired to go to the next or previous page it crash and display the below error :

> can only concatenate str(not ""NoneType) to str

            query=request.GET.get("search")

            paginator = Paginator(queryset_list, 5) 

            page_request_var = "page"

            print("page_request_var===>",page_request_var)

            page = request.GET.get(page_request_var)

            print("page===>",page)

            queryset = paginator.get_page(page)

            print("queryset===>",queryset)

When i print **page** it display None

 In the browser it suppose to display **page=2&search=sam**

but instead 

it display **/?=2&20search%20=%20sam**

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