This code segment is in a grid BeforeRowColChange to handle keyboard moves for highlighting. The page up works fine, but page down has an EOF crash:

case lastkey_fn = 18  && page up
  skip -10    
  if bof()
    go top
  endif 
case lastkey_fn = 3  && page down
  skip 10
  if eof()
    go bottom
  endif

The code works fine outside of grid, and up/down arrows work fine in grid also. Any ideas?