Looks like babble is breaking Discourse at the moment: https://meta.discourse.org/t/discourse-fails-with-this-resource-is-not-a-function-how-do-i-find-which-plugin-it-is/53571/4
I’ve had to remove it but my users are having chat-abstinence issues 
Looks like babble is breaking Discourse at the moment: https://meta.discourse.org/t/discourse-fails-with-this-resource-is-not-a-function-how-do-i-find-which-plugin-it-is/53571/4
I’ve had to remove it but my users are having chat-abstinence issues