According to DBI::Changes, the option to pass a limit to the rowcount as a second parameter is added in DBI 1.26.

Changes in DBI 1.26, 13th June 2002

Added $max_rows parameter to fetchall_arrayref() to optionally limit the number of rows returned. Can now fetch batches of rows.
Me, as being one of the people who noticed this error, am still using DBI 1.21.

I hate having to upgrade everything every few months — especially if everything else works very well.

Update: In case anyone wonders, I was referring to this sentence:

But some people even seem to get these errors with the undef in there!

In reply to Re: DBI::fetchall_arrayref() error by bart
in thread DBI::fetchall_arrayref() error by blokhead

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