The solution is:

1) not to use maintenance plans

2) add FULLSCAN

3) write a better script (Hint: there are lots out in SSC)

Some best practices:

1) do not try to defragment heaps

2) do not defragment indexes with less than 8 pages (1 extent)

3) do defragment the index if it is more than 10% fragmented

4) do reindex if the index is more than 30% fragmented