The Jargon File (version 4.4.7, 29 Dec 2003):

jump off into never-never land
 v.

    [from J. M. Barrie's Peter Pan] An unexpected jump in a program that
    produces catastrophic or just plain weird results. Compare hyperspace.


The Free On-line Dictionary of Computing (30 December 2018):

jump off into never-never land

   [J. M. Barrie's "Peter Pan"] Same as branch to Fishkill, but
   more common in technical cultures associated with non-IBM
   computers that use the term "jump" rather than "branch".

   Compare hyperspace.

   [Jargon File]

   (1994-12-15)