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Thread: json_encode(): Invalid UTF-8 sequence in argument

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    json_encode(): Invalid UTF-8 sequence in argument

    Hello,

    I found this in the host error_log:

    PHP Warning: json_encode(): Invalid UTF-8 sequence in argument in /home/www/public_html/wp-includes/functions.php on line 2669

    ClassiPress 3.4.1
    WordPress 4.2.3
    PHP Version 5.3.29
    MySQL Version 5.5.42

    functions.php on line 2669
    PHP Code:
        $json call_user_func_array'json_encode'$args ); 
    PHP Code:
    function wp_json_encode$data$options 0$depth 512 ) {
        
    /*
         * json_encode() has had extra params added over the years.
         * $options was added in 5.3, and $depth in 5.5.
         * We need to make sure we call it with the correct arguments.
         */
        
    if ( version_comparePHP_VERSION'5.5''>=' ) ) {
            
    $args = array( $data$options$depth );
        } elseif ( 
    version_comparePHP_VERSION'5.3''>=' ) ) {
            
    $args = array( $data$options );
        } else {
            
    $args = array( $data );
        }

        
    $json call_user_func_array'json_encode'$args );

        
    // If json_encode() was successful, no need to do more sanity checking.
        // ... unless we're in an old version of PHP, and json_encode() returned
        // a string containing 'null'. Then we need to do more sanity checking.
        
    if ( false !== $json && ( version_comparePHP_VERSION'5.5''>=' ) || false === strpos$json'null' ) ) )  {
            return 
    $json;
        }

        try {
            
    $args[0] = _wp_json_sanity_check$data$depth );
        } catch ( 
    Exception $e ) {
            return 
    false;
        }

        return 
    call_user_func_array'json_encode'$args );

    How to fix it?

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