Another error diffing simple tables

[gonzaloserrano]

Gist: https://gist.github.com/gonzaloserrano/f7aaa84f69dbb80d701e

$localTable = [
["fd", "df"],
["fd", "fd"],
[null, "fd"],
["fd", null],
];

against

$remoteTable = [
["A", "new_column_2"],
[null, null],
["fd", "df"],
["fd", "fd"],
];

shoots

Notice: Trying to get property of non-object in /Users/gonzalo/daff-test/vendor/paulfitz/daff-php/gen/lib/coopy/TableDiff.class.php on line 347
<table>
<thead>
<tr class="index"><td class="index">@:@</td><td></td><td>0:0</td><td>1:1</td></tr>
<tr class="spec"><td class="index"></td><td>!</td><td>(fd)</td><td>(df)</td></tr>
<tr class="header"><th class="index"></th><th>@@</th><th>A</th><th>new_column_2</th></tr>
</thead>
<tbody>
<tr class="add"><td class="index">-:1</td><td>+++</td><td></td><td></td></tr>
<tr><td class="index">0:2</td><td></td><td>fd</td><td>df</td></tr>
<tr><td class="index">1:3</td><td></td><td>fd</td><td>fd</td></tr>
<tr class="remove"><td class="index">2:-</td><td>---</td><td></td><td>fd</td></tr>
</tbody>
</table>

Edit: interestingly, if you remove last row from both tables, you get a Alignment.hx:277: Ordering took too long, something went wrong.

Thanks!

[paulfitz]

Should be fixed in 1.2.7, please reopen if persists. Tests added. Thanks @gonzaloserrano!