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Craft 3.3.15

Previous version of the entry was saved 1 minute ago, so no changes in settings between the two entries.

Any ideas on how to debug this?

Update - here's the error, which looks very much like what @mtnorthrop is getting:

2019-11-20 10:41:44 [-][1][-][error][TypeError] TypeError: Argument 1 passed to craft\helpers\ElementHelper::isTempSlug() must be of the type string, null given, called in /Users/andrei/Desktop/dev/hl/mailbuilder/vendor/craftcms/cms/src/controllers/EntryRevisionsController.php on line 473 and defined in /Users/andrei/Desktop/dev/hl/mailbuilder/vendor/craftcms/cms/src/helpers/ElementHelper.php:47
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  • Check your Craft storage/logs files for [error] - that should contain the underlying error message for the "unknown error" flash message.
    – Brad Bell
    Nov 15 '19 at 5:14
  • I've also experienced this issue. The logs report: TypeError: Argument 1 passed to craft\helpers\ElementHelper::isTempSlug() must be of the type string, null given, called in /vendor/craftcms/cms/src/controllers/EntryRevisionsController.php on line 473 and defined in /vendor/craftcms/cms/src/helpers/ElementHelper.php:47 Nov 21 '19 at 10:25
  • @mtnorthrop did you find a solution?
    – aaandre
    Nov 21 '19 at 22:18
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    This was a bug in Craft that's been fixed as of Craft 3.3.16: github.com/craftcms/cms/blob/develop/… Going to go ahead and vote to close this as a bug report.
    – Brad Bell
    Nov 23 '19 at 0:26
  • @aaandre I can confirm that updating to Craft 3.3.16.1 fixed this issue for me. Nov 23 '19 at 10:42
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This bug was due to an issue with the Stringify library and was fixed in Craft 3.3.16.1, as stated by Brad Bell in his comment on the original question.

Upgrading to Craft 3.3.16.1 fixes this issue.

(I'm posting this as an answer in case anybody else runs into the same issue.)

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  • The upgrade fixed the issue for me, too
    – aaandre
    Dec 1 '19 at 20:42

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