_registerPluginCode is not a function

Uncaught TypeError: Discourse._registerPluginCode is not a function
Url: Usko ja rukous
Line: 49
Column: 23
Window Location: Usko ja rukous

I found this in my logs. There’s quite a few lines in there, I’ll make new topics of the things that appear most (or is it fruitful?). This caught my eye, because account activation seems the one place where security is a high issue…

With no reproduction steps this is a duplicate of