Ticket #13672: tcache.diff

django/templatetags/cache.py

@@ -24 +24 @@
         except (ValueError, TypeError):
             raise TemplateSyntaxError('"cache" tag got a non-integer timeout value: %r' % expire_time)
         # Build a unicode key for this fragment and all vary-on's.
-        args = md5_constructor(u':'.join([urlquote(resolve_variable(var, context)) for var in self.vary_on]))
+        keys = ""
+        for var in self.vary_on:
+            try:
+                keys += ":" + urlquote(resolve_variable(var, context))
+            except:
+                keys += ":None"
+        args = md5_constructor(keys)
         cache_key = 'template.cache.%s.%s' % (self.fragment_name, args.hexdigest())
         value = cache.get(cache_key)
         if value is None: