Line 385 and 386:
$current = explode("\n", $current);
$current = $current!='' ? explode("\n", $current) : array_fill(0,7,'');
That will cause errors, but commenting out either of the lines will work.
Also, another thing I'd wish to add, the output isn't always the same total width. I'd like to see this being changed so that a "definite" width can be set.