if (!scm_is_vector (extents))
{
extents = scm_c_make_vector (breaks.size () - 1, SCM_EOL);
- for (vsize i = 0; i < breaks.size () - 1; i++)
+ for (vsize i = 0; i + 1 < breaks.size (); i++)
{
int st = Paper_column::get_rank (cols[breaks[i]]);
int ed = Paper_column::get_rank (cols[breaks[i+1]]);