I'm getting this error logging a lot on a project on 8.18.13 on Umbraco Cloud From what I understand this is likely caused by an Ajax.BeginForm() not being set up correctly. This is only used in a single view which when I test it on local/dev/live is working exactly as expected and no errors like this are logged on local/dev The website gets fairly high traffic so the only difference seems to be that the view could be being hit quite a lot, but I'm not sure Anyone come across this before?