walk off the end of

from Jargon File (4.4.4, 14 Aug 2003)
walk off the end of
 vt.

   To run past the end of an array, list, or medium after stepping
   through it -- a good way to land in trouble. Often the result of an
   {off-by-one error}. Compare {clobber}, {roach}, {smash the stack}.
from The Free On-line Dictionary of Computing (8 July 2008)
walk off the end of

   To run past the end of an {array}, {list} or medium after
   stepping through it - a good way to land in trouble.  Often
   the result of an {off-by-one error}.  Compare {clobber},
   {roach}, {smash the stack}.
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