Clojurians Log v2

What is the meaning of this error? Am I doing something completely ridiculous?

[2025-08-27 11:04:19.580 - WARNING] :shadow.cljs.devtools.server.util/handle-ex - {:msg {:op :cljs-compile, :input {:code "(defn testing [data]\n  (-> data namespace keyword))", :ns lol.sudoscience.niaiserie.db, :repl true}, :include-init false, :call-id 5, :from 3}}
AssertionError Assert failed: (ana/ast? sym)
        cljs.compiler/fn--4197 (compiler.cljc:504)
        cljs.compiler/fn--4197 (compiler.cljc:504)
        clojure.lang.MultiFn.invoke (MultiFn.java:229)
        cljs.compiler/emit (compiler.cljc:205)
        cljs.compiler/emit (compiler.cljc:185)
        cljs.compiler/emits (compiler.cljc:212)
        cljs.compiler/emits (compiler.cljc:207)
        cljs.compiler/fn--4388 (compiler.cljc:836)
        cljs.compiler/fn--4388 (compiler.cljc:814)
        clojure.lang.MultiFn.invoke (MultiFn.java:229)
        cljs.compiler/emit (compiler.cljc:205)
        cljs.compiler/emit (compiler.cljc:185)

Code:

(defn testing [data]
  (-> data namespace keyword))

Though I tried this with other function definitions and that doesn't seem relevant. It first appeared when I was trying to define a multimethod, fwiw.