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After upgrading from 4.8.8 to 4.9 we can no longer view the Subscribers list. The page displays this:
There has been a critical error on this website
WordPress reports this error:
An error of type E_ERROR was caused in line 7 of the file wp-content/plugins/newsletters-lite/views/admin/subscribers/index.php. Error message: Uncaught Error: Call to a member function queued_items() on wp-content/plugins/newsletters-lite/views/admin/subscribers/index.php:7
If I remove the corresponding if clause in index.php it works.
We are testing without other plugins enabled.