Cannot edit Sharepoint 2013 wiki

We have a collection of wikis. A few of the documents can no longer be edited. When you click on Edit Page, the wiki does not get the line around it and it is not editable. The tools are greyed out. It does get the yellow bar across the top that says "Status: Checked out and editable." But it is not. And when you check it back in it returns an error: "Sorry something went wrong. An unexpected error has occurred."

In IE 11 I watched the scripts and when Edit page is clicked an exception is thrown:
Unable to set property 'ListId' of undefined or null reference

Thanks
gglollcAsked:
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IsaacSharePoint Client Side DeveloperCommented:
Have you tried it in other browsers?

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gglollcAuthor Commented:
Yes, the latest version of Mozzilla. Same result.
Walter CurtisSharePoint AEDCommented:
Have a similar issue on various pages, not just wiki pages and somewhat sporadically. My work around is to explicitly check out the page first, then go to edit mode and it seems to work every time.

Hope that helps...
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gglollcAuthor Commented:
Unfortunately that didn't work on our pages.
Veronique PalmerFounder and CEOCommented:
Maybe the wiki has become corrupted somehow.  Maybe copy / paste the text into a new wiki and delete the old one?
Walter CurtisSharePoint AEDCommented:
Information provided is accurate and correct.
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