Error log showing referring FastCGI sent in stderr

[Vanessa]

I’m seeing a lot of things similar to the below in my error logs:

What does it mean, and how can I fix it?

2018/07/07 02:16:22 [error] 10086#10086: *295043 FastCGI sent in stderr: “PHP message: 21711” while reading response header from upstream, client: 108.44.202.74, server: http://www.crossdresserheaven.com, request: “GET /wp-admin/admin-ajax.php?action=kleo_bp_ajax_call&current_notifications=5&current_messages=30 HTTP/1.0”, upstream: “fastcgi://unix:/var/run/php7.2-fpm-crossdresserheaven.sock:”, host: “www.crossdresserheaven.com”, referrer: “https://www.crossdresserheaven.com/crossdresser-forums/”

[Kieran_SQ]

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[Vanessa]

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[Kieran_SQ]

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[Vanessa]

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[Kieran_SQ]

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[Vanessa]

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[Kieran_SQ]

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[Radu]

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[Vanessa]

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[Vanessa]

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[Radu]

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[Vanessa]

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[Radu]

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[Vanessa]

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[Radu]

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[Vanessa]

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[Radu]

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[Vanessa]

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[Radu]

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[Vanessa]

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[Vanessa]

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[Radu]

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[Author]

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