Probably, you're not using strict and warnings. Either that, or you have both a scalar $col and an array @col in the same scope, which is just asking for confusion. Or, I suppose, both, but we'll assume just one at a time for now ;-)

$col->[26] = $col->[26] eq '0" ? '' : $col->[26]; # note the extra -> 
+in there that was missing from your code.

# or, more succinctly:
$col->[26] = '' if $col->[26] eq '0';

# or, probably better yet:
$col->[26] ||= '';
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