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A bug in my version of MIT Scheme

We have found a bug in the multiplication, *, procedure of our version of
Scheme.  The deeper root of the problem is apparently in the primitive for
multiplying fixnums.  Multiplying 0 times a negative number results in
#[(undefined-type-code 81) 0] .  It is easy enough to work around this, but
someone maintaining MIT Scheme might look into this if it hasn't already
been fixed.  The version we're using is the VAX/VMS version of MIT Scheme,
Microcode 6.1, Runtime 11.2, Features 1.1, Student 11.1, and is dated
Thursday May 31, 1985.