Somewhere in your code, something calls $cgi->param('foo'), but allows it to return more than one parameter. The line could look like:

my @foos= $cgi->param('foo');

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or

print_results( foo => $cgi->param('foo'), is_admin => 0 );

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The second form is the problematic form, because $cgi->param('foo') could return more than one item but nothing in your code expects that. The most likely fix is to change that line to:

print_results( foo => scalar($cgi->param('foo')), is_admin => 0 );

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In reply to Re: "CGI::param called in list context" confusion by Corion
in thread "CGI::param called in list context" confusion by Anonymous Monk

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