diff --git a/app/logical/sources/strategies/nico_seiga.rb b/app/logical/sources/strategies/nico_seiga.rb
index 4939dc051..a3f7fe316 100644
--- a/app/logical/sources/strategies/nico_seiga.rb
+++ b/app/logical/sources/strategies/nico_seiga.rb
@@ -23,11 +23,18 @@ module Sources
       end
 
       def get
-        agent.get(normalized_url) do |page|
-          @artist_name, @profile_url = get_profile_from_page(page)
-          @image_url = get_image_url_from_page(page)
+        page = agent.get(normalized_url)
+
+        if page.search("a#link_btn_login").any?
+          # Session cache is invalid, clear it and log in normally.
+          Cache.delete("nico-seiga-session")
+          @agent = nil
+          page = agent.get(normalized_url)
         end
 
+        @artist_name, @profile_url = get_profile_from_page(page)
+        @image_url = get_image_url_from_page(page)
+
         # Log out before getting the tags.
         # The reason for this is that if you're logged in and viewing a non-adult-rated work, the tags will be added with javascript after the page has loaded meaning we can't extract them easily.
         # This does not apply if you're logged out (or if you're viewing an adult-rated work).