C-c C-c-ing this code

#+begin_src scheme
(define (foo x)
  ;just add one
  (+ 1 x)) ; comment
#+end_src

causes Racket (geiser) to freeze up. Sometimes I see a

Code block evaluation complete.
geiser-repl--maybe-send: Args out of range: 61, 62

-like message. The culprit is the *; comment *next to the `(+ 1 x))` line.
If I take it out the *; just add one* doesn't cause a problem. This
behavior doesn't happen in naked racket or regular geiser on racket.

LB