- ispt[i] = isamb_pp_open (zi->reg->isamb, isam_p[from+i]);
- if (isamb_pp_read (ispt[i], ti->tmpbuf))
- heap_insert (ti, ti->tmpbuf, i);
- else
- isamb_pp_close (ispt[i]);
+ if (isam_p[from+i]) {
+ ispt[i] = isamb_pp_open (zi->reg->isamb, isam_p[from+i]);
+ if (isamb_pp_read (ispt[i], ti->tmpbuf))
+ heap_insert (ti, ti->tmpbuf, i);
+ else
+ isamb_pp_close (ispt[i]);
+ }