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How can I use rowspan with paging in XML mode?

My grid source is like below:

<row id=0>
<cell rowspan=2>...</cell>
<cell>...
...
</row>

<row id=1>
<cell>...</cell>
<cell>...
...
</row>

<row id=2>
<cell rowspan=2>...</cell>
<cell>...
...
</row>

<row id=3>
<cell>...</cell>
<cell>...
...
</row>


when rowid is even, i'm using rowspan=2,
a certain error(_childIndexes is null or isn't an object) happens and "PAGE_NAVIGATION" below this list doesn't appear.

what's the problem and how can i solve this?
thanks in advance.

Paging and rowspans can't be used in same time. 
While it possible to configure grid, so it will render rowspan and paging in same time, it will work unstable. 
Sample sent by email.