Index: adhocracy/lib/helpers/text_helper.py
===================================================================
--- adhocracy/lib/helpers/text_helper.py	(revision 826)
+++ adhocracy/lib/helpers/text_helper.py	(revision 882)
@@ -12,4 +12,6 @@
 def url(text, **kwargs):
     import page_helper as page
+    if text is None:
+        return ''
     url = page.url(text.page, in_context=text == text.page.variant_head(text.variant))
     if text.page.has_variants and text.variant != text.HEAD: