[Plugin: Network Ping] Does not load ping field in backend
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At the place where I would expect the ping field to show up, it says:
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, ‘_do_return_true’ was given in /var/www/vhosts/SERVERNAME/httpdocs/wp-includes/plugin.php on line 170
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