quickly press SPC w u and hope nobody sees that

and stop writing clojure that throws exceptions. That’s not idiomatic Clojure 😉

I guess its known behavior?

If errors duplicate the source code buffers, then it sounds like something is wrong. I get loads of Clojure code errors every day and all I get is a popup telling me the error message.

+1, same here. Haven’t dived into this problem though.

I get the pop up too but it also multiplies the source code buffers (windows?). It doesn't happen each and every time but it happens often enough that I decided to ask around. SPC w u does the trick though