Name: Anonymous 2007-11-30 11:15
LISP
debugger invoked on a UNDEFINED-FUNCTION in thread #<THREAD "initial thread" {10025E1111}>:
The function NULLP is undefined.
Type HELP for debugger help, or (SB-EXT:QUIT) to exit from SBCL.
restarts (invokable by number or by possibly-abbreviated name):
0: [ABORT] Reduce debugger level (to debug level 1).
1: Exit debugger, returning to top level.
("bogus stack frame")