Cannot use 'in' operator to search for 'length' in 20

[kghbln]

Setup

• MediaWiki | 1.35.3 (086b4f1)09:56, 26 July 2021
• PHP | 7.4.3 (apache2handler)
• MariaDB | 10.3.29-MariaDB-0ubuntu0.20.04.1
• ICU | 66.1
• SimpleBatchUpload | 1.8.2

Issue

Uploading files via special page "BatchUpload" fails on MonoBook, Medik and Vector..

jQuery.Deferred exception: Cannot use 'in' operator to search for 'length' in 20 TypeError: Cannot use 'in' operator to search for 'length' in 20
    at isArrayLike (https://www.example.org/w/load.php?lang=en&modules=ext.SimpleBatchUpload%7Cext.SimpleBatchUpload.jquery-file-upload%7Cjquery%7Cjquery.ui&skin=medik&version=r3in5:33:476)
    at Function.each (https://www.example.org/w/load.php?lang=en&modules=ext.SimpleBatchUpload%7Cext.SimpleBatchUpload.jquery-file-upload%7Cjquery%7Cjquery.ui&skin=medik&version=r3in5:31:930)
    at HTMLDocument.<anonymous> (https://www.example.org/w/load.php?lang=en&modules=ext.SimpleBatchUpload%7Cext.SimpleBatchUpload.jquery-file-upload%7Cjquery%7Cjquery.ui&skin=medik&version=r3in5:1:308)
    at mightThrow (https://www.example.org/w/load.php?lang=en&modules=ext.SimpleBatchUpload%7Cext.SimpleBatchUpload.jquery-file-upload%7Cjquery%7Cjquery.ui&skin=medik&version=r3in5:76:149)
    at process (https://www.example.org/w/load.php?lang=en&modules=ext.SimpleBatchUpload%7Cext.SimpleBatchUpload.jquery-file-upload%7Cjquery%7Cjquery.ui&skin=medik&version=r3in5:76:808) undefined

Uncaught TypeError: Cannot use 'in' operator to search for 'length' in 20
    at isArrayLike (load.php?lang=en&modules=ext.SimpleBatchUpload|ext.SimpleBatchUpload.jquery-file-upload|jquery|jquery.ui&skin=medik&version=r3in5:33)
    at Function.each (load.php?lang=en&modules=ext.SimpleBatchUpload|ext.SimpleBatchUpload.jquery-file-upload|jquery|jquery.ui&skin=medik&version=r3in5:31)
    at HTMLDocument.<anonymous> (load.php?lang=en&modules=ext.SimpleBatchUpload|ext.SimpleBatchUpload.jquery-file-upload|jquery|jquery.ui&skin=medik&version=r3in5:1)
    at mightThrow (load.php?lang=en&modules=ext.SimpleBatchUpload|ext.SimpleBatchUpload.jquery-file-upload|jquery|jquery.ui&skin=medik&version=r3in5:76)
    at process (load.php?lang=en&modules=ext.SimpleBatchUpload|ext.SimpleBatchUpload.jquery-file-upload|jquery|jquery.ui&skin=medik&version=r3in5:76)