Can't delete topics - Error 500, rake aborted!

[fzngagan (Faizaan Gagan)]

Take a look at this. Are you trying to work with a restricted category which hasn’t got any groups attached to it?

MessageBus::InvalidMessageTarget (MessageBus::InvalidMessageTarget)

When trying to create a new topic in a specific category, I get a 500 error. It seems to be specific to this category, since I can create a topic without problems in other categories. Investigating lead me to MessageBus::InvalidMessageTarget (MessageBus::InvalidMessageTarget) I tracked it down to lib/models/user_action.rb (line 293). On line 265 of the same file is a todo: TODO there are conditions when this is called and user_id was already rolled back and is invalid. I think this is wha…