While trying to add a new feature to the backend, I accidentally pushed the wrong update, which broke some of the extensions on the computers that received the update. The update was up for less than 2 minutes, so I don’t think a lot of people received it.

But if you are receiving error messages such as “cannot call method of undefined”, you have two options:

• You can disable XKit, wait for an hour or two and re-enable it. After that, XKit will try to update itself again, and fix the borked update.
• Or, especially if you’ve backed up your data using XCloud, reset XKit by going to www.tumblr.com/xkit_reset. This will, however, delete your preferences and settings such as blacklist and blocked posts.

I’m terribly, terribly sorry about this, it is all my fault since I’ve skipped some of the safety measurements I have to prevent something like this from happening. Thank you for your understanding.