PHP Strict Standards: call_user_func_array() expects parameter 1 to be a valid

  • Monitoring my error_log a bit closer I’m seeing this error:

    PHP Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method Share_Kindle::inject_service() should not be called statically in /home/user/public_html/blog/wp-includes/plugin.php on line 173

    I appreciate that this is a PHP Strict Standard, but it should still be addressed as an issue.

    https://www.ads-software.com/plugins/send-to-kindle/

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