Uncaught (in promise) TypeError: newPageText is undefined

[Dreamy-Jazz]

When hist-merging the case Ppp00007 I got the following JavaScript error:

Uncaught (in promise) TypeError: newPageText is undefined
    spiHelperPostRenameCleanup https://en.wikipedia.org/w/index.php?title=User:GeneralNotability/spihelper.js&action=raw&ctype=text/javascript:1772