I just noticed that with MainWP 4.5.0.1 the database updater hangs after updating the first 10 sites (the number of concurrent updates) and than hangs. I have to Close the modal and do it again, until I’ve had all sites. There are errors in the browser console, one for every site:
mainwp-database-updater.js?ver=1.2:194
Uncaught ReferenceError: countRealItemsUpdated is not defined
at Object.success (mainwp-database-updater.js?ver=1.2:194:37)
at c (load-scripts.php?c=0&load%5Bchunk_0%5D=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-mouse,jquery-ui-resizable,jquery-ui-draggable,jquery-ui-controlgroup,j&load%5Bchunk_1%5D=query-ui-checkboxradio,jquery-ui-button,jquery-ui-dialog,zxcvbn-async&ver=993c7dd1f91dd452c6c2a4a81634bc1d:2:25266)
at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load%5Bchunk_0%5D=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-mouse,jquery-ui-resizable,jquery-ui-draggable,jquery-ui-controlgroup,j&load%5Bchunk_1%5D=query-ui-checkboxradio,jquery-ui-button,jquery-ui-dialog,zxcvbn-async&ver=993c7dd1f91dd452c6c2a4a81634bc1d:2:26015)
at l (load-scripts.php?c=0&load%5Bchunk_0%5D=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-mouse,jquery-ui-resizable,jquery-ui-draggable,jquery-ui-controlgroup,j&load%5Bchunk_1%5D=query-ui-checkboxradio,jquery-ui-button,jquery-ui-dialog,zxcvbn-async&ver=993c7dd1f91dd452c6c2a4a81634bc1d:2:77721)
at XMLHttpRequest.<anonymous> (load-scripts.php?c=0&load%5Bchunk_0%5D=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-mouse,jquery-ui-resizable,jquery-ui-draggable,jquery-ui-controlgroup,j&load%5Bchunk_1%5D=query-ui-checkboxradio,jquery-ui-button,jquery-ui-dialog,zxcvbn-async&ver=993c7dd1f91dd452c6c2a4a81634bc1d:2:80204)