I was trying both the plugins Responsive Lightbox and Email newsletter for one of my site and I get below error when I installed on local xampp.
When I deactivate Responsive Lightbox, Email newsletter works fine.
Warning: array_merge(): Argument #2 is not an array in H:\xampp\htdocs\ad\wp-content\plugins\email-newsletter\extension\readygraph\extension.php on line 37
Could you please help?
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