examples/trek.bas program errors out

[datadriver]

Running the trek.bas from Linux I get the following error:

          GENERATING GALAXY.Error on line 420: NEXT without FOR
  Hint: Every NEXT needs a matching FOR above; NEXT I pairs with FOR I = …
  G(I,J)=K3*100+B3*10+FNR(1) : NEXT J : NEXT I : IF K9>T9 THEN T9=K9+1

To recreate:

1. download basic-linux.tar.gz from v2.1.1
2. extract
3. ./basic examples/trek.bas
4. see Enterprise ASCII
5. press enter
6. see error above