Install Flatpress and create another blog article. The first blog article in the Flatpress blog contains a [more] tag. If you click on the first blog article and then on [Read more...], the following error message appears in the "this page/next page" section.
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Warning: Trying to access array offset on value of type null in .../fp-includes/core/core.wp-pluggable-funcs.php on line 66 Warning: Undefined array key 1 in .../fp-includes/core/core.fpdb.class.php on line 935