You could change the *debugger-hook* variable to handle the conditions as what you want, e.g.

(defvar *use-slime-debugger* t)

(setq *debugger-hook*
               (let* ((slime-debugger-hook *debugger-hook*)
                      (new-debugger-hook  (lambda (&rest args)                                                        
                                            (if *use-slime-debugger* 
                                                (apply slime-debugger-hook args)

                                                ; do what you want

                                                ))))
                 new-debugger-hook))

But be aware, there might be additional problems you could meet.

     Best regards,
Xiaofeng Yang

2014-03-06 7:19 GMT+08:00 Christopher Laux <ctlaux@gmail.com>:

Hi,

is there a good way to prevent slime (or rather swank) from dropping into the slime debugger depending on the value of a variable? Specifically I want to limit the number of open debugger windows to 1 and simply log all further simultaneous errors. Any help appreciated,

Chris