X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/4167e7083d75589e9dbbaa05bfcb43d27b60b42f..ef93835e5356373ea5190e070cce80d42df616b0:/src/social/templatetags/social_tags.py

diff --git a/src/social/templatetags/social_tags.py b/src/social/templatetags/social_tags.py
index 4cc621525..ce61985d2 100755
--- a/src/social/templatetags/social_tags.py
+++ b/src/social/templatetags/social_tags.py
@@ -34,7 +34,7 @@ def render_cite(cite):
 @ssi_variable(register, patch_response=[ssi_vary_on_cookie])
 def book_shelf_tags(request, book_id):
     if not request.user.is_authenticated():
-        return None
+        return ''
     book = Book.objects.get(pk=book_id)
     lks = likes(request.user, book, request)