When the config for this module has not been set, the following warning may be dumped into AJAX output if your Drupal site is configured to display warnings.
<br /> <b>Warning</b>: Undefined array key "empty_text" in <b>/data/app/modules/contrib/empty_fields/src/Plugin/EmptyFields/EmptyFieldText.php</b> on line <b>38</b><br />
Use the PHP null coalescing operator to reduce the null config value to an empty string.
Patch the module.
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Active
1.0
Code
Faced same issue. Changes from #2 fixed the issue.
Here is that changes in patch format for a composer based to fetch.