undefined method `user' for nil:NilClass in Ruby Tokbox API - ruby-on-rails

Question

i am trying to use the tokbox api and have the following error:
Started GET "/en/stream" for 127.0.0.1 at 2018-06-02 18:38:57 +0800
Processing by UsersController#stream as HTML
Parameters: {"locale"=>"en"}
Rendering users/stream.html.erb within layouts/application
Rendered users/stream.html.erb within layouts/application (3.8ms)
Completed 500 Internal Server Error in 34ms (ActiveRecord: 0.3ms)
ActionView::Template::Error (undefined method `user' for nil:NilClass):
1: <%= javascript_include_tag "//static.opentok.com/webrtc/v2.2/js/TB.min.js" %>
2: <h1>Your stream</h1>
3: <div id="publisher"></div>
4: Link to your stream: <%= link_to watch_url(#stream.user.id), watch_url(#stream.user.id) %>
app/views/users/stream.html.erb:4:in `_app_views_users_stream_html_erb__3447765015494674598_70186549432640'
My User/stream.html.erb looks like:
<%= javascript_include_tag "//static.opentok.com/webrtc/v2.2/js/TB.min.js" %>
<h1>Your stream</h1>
<div id="publisher"></div>
Link to your stream: <%= link_to watch_url(#stream.user.id), watch_url(#stream.user.id) %>
My UserController looks like :
def stream
#stream = User.find(params[:id]).stream
#stream = current_user.stream || current_user.create_stream
gon.opentok = opentok_data(#stream)
end
def watch
#stream = User.find(params[:id]).stream
gon.opentok = opentok_data(#stream)
end
private
def opentok_data(stream)
token = OpenTokClient.generate_token(stream.opentok_session_id)
{ sessionId: stream.opentok_session_id, apiKey: Figaro.env.opentok_api_key, token: token }
end
My user model has one stream, and my stream model has one user.
Does anyone knows why it is not recognising the user ?