Notice: Undefined offset: 0

This issue popped up for me as well. I manually fixed it for now by doing the following:

Line 185:

if (isset($source[0])) {
    $titletext_rep=str_replace("%name", $source[0], $titletext_rep);
}

Line 207

if (isset($source[0])) {
    $alttext_rep=str_replace("%name", $source[0], $alttext_rep);
}

This is just a hack so you don’t receive the errors. Hopefully the author will fix this issue permanently.