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I have small wordpress site with this plugin on my self-hosted machine, with white ip and first level domain attached to it. When I try to change any setting in this plugin I get the “The response is not a valid JSON response” error. Before last plugin update everything worked normally. I suspect it may have something with my API key, because I installed this plugin before changing my domain, but fresh reinstall of plugin doesn’t help. All other plugins settings setting saving normally.