From DBI's fetchall_arrayref section:

If called on an inactive statement handle, fetchall_arrayref returns undef.

There may be other stuff in the DBI documentation that may be of interest. Have you read it?

Optimising for fewest key strokes only makes sense transmitting to Pluto or beyond

In reply to Re: Does fetchall_arrayref() ever return a NULL? by GrandFather
in thread Does fetchall_arrayref() ever return a NULL? by bartender1382

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