1. Go to https://en.wikipedia.org/wiki/Comparison_of_disk_encryption_software?debug=1#Operating_systems
2. Click twice on the "Android" column
3. Click once in the "Linux" column
**Expected behavior**
The table would be sorted by that column
**Actual result**
```lang=json
{
"errorMessage": "TypeError: parsers[j] is undefined",
"url": "https://en.wikipedia.org/static/1.26wmf13/resources/src/jquery/jquery.tablesorter.js",
"lineNumber": 210,
"columnNumber": 4,
"errorObject": {}
}
```
from the line
> cols.push( parsers[j].format( getElementSortKey( $row[0].cells[j] ), table, $row[0].cells[j] ) );
of
https://github.com/wikimedia/mediawiki/blob/1f54fccca868fa4862df95245957f3028c67336e/resources/src/jquery/jquery.tablesorter.js#L210
By the time the error happens, `i===0`, `j===10` and `parsers.length===10` (so there is only `parsers[0]` to `parsers[9]`, and `parsers[j]` is undefined).