invalid reference notice
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In line 330 of plugin version 1.5.2 a method result is passed by reference:
if ( wp_remote_retrieve_response_code( wp_remote_head( "http:$url" ) ) !== 200 ) {
The correct way would be to
$_remoteUrl = wp_remote_head( "http:$url" ); if ( wp_remote_retrieve_response_code( $_remoteUrl ) !== 200 ) {
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