Incorrect format Error message. Omitted #\newline at the end of the message?

[vlad-km]

CL-USER> (on-data #'input)
#<JS-OBJECT [object Object]>
CL-USER> UNBOUND-VARIABLE: Unbound variable *KB-EVUNBOUND-VARIABLE: Unbound variable *KB-EVUNBOUND-VARIABLE: Unbound variable *KB-EVUNBOUND-VARIABLE: Unbound variable *KB-EVUNBOUND-VARIABLE: Unbound variable *KB-EV
CL-USER> 

[kchanqvq]

What exactly should be the error here? Looks like an error happened in the middle of formatting the error, thus an infinite regress.

[vlad-km]

1. #'input - This is lisp code. Which is executed when handling third-party onData events in a JS environment. Lisp code without handler-case.
2. The message output to jqconsole is clearly not coming from repl. error-trace is not printed. There are no messages or traces in the JS console.